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What do all those lines mean?  It looks so confusing!  How do you even understand what it means?  Looks like a poorly made paint by numbers picture to me!  These are just a few things I have heard from people when they initially look at a pump curve. 

Looking at a pump curve can be an overwhelming task, unless you know what you are looking for.  But the truth is, you don’t need to have an engineering degree to understand a pump curve.

Yes, pump curves can be confusing, especially as some pump curves are more technical than others.  Hopefully by the time you finish reading this post you will be able to look at even the more technical curves and find the most basic information necessary to finding the right pump. 

Think of this post as a layman’s guide to pump curves.  We will look at a few basic pump curves.  In future posts we will look at more technical pump curves and how to interpret the corresponding data for more advanced applications. 

For the sake of clarity in this post however, we will look at one of the more commonly used pumps, an electric end-suction centrifugal water pump.  We will also look at interpreting the most basic information (head/flow) needed to help you pick out the right water pump for your given application.   

The truth is, when in doubt, ask a Water Pump Specialist for help in finding the correct water pump for you.  We would be more than happy to help you pick out the right pump!

What is a Pump Curve?

A pump performance curve is simply a graph or chart that represents the performance capabilities of a given water pump.  A pump manufacturer conducts a variety of tests and the findings are then reflected on a graph, which we refer to as the pump curve.  A pump curve will typically show not just the maximum capabilities of the pump, but just as important, many pump curves will give information helpful in determining the best efficiency point (BEP) for flow rates as well as reflecting the preferred operating range (POR) of the water pump.  Once you know how to read a pump curve you will be able to determine what to expect from your water pump: how many feet is it capable of pumping, how many gallons per minute, and what will be the ideal operating performance for efficiency, as well as other important information.

The Most Common Information a Pump Curve Provides

• Total Dynamic Head

Total dynamic pump head, most commonly referred to as total head, concisely stated is the height that a water pump is capable of raising a liquid.  It is the total vertical distance that the pump is capable of ‘pumping’.  It answers the question, “How high can it pump?”  The greater the pressure, the higher the head.  The lower the pressure, the lower the head.

• Flow Rate

Flow rate, or rate of flow, is the total maximum amount of liquid flow that a pump can produce during a specified period of time.  It is almost always measured per minute and most pump curves will show either gallons per minute (GPM) or liters per minute (LPM), or commonly both.  Flow rate answers the question, “How many gallons can I expect?”  The greater the pressure, the higher the flow rate.  The lower the pressure, the lower the flow rate. 

• NPSHr (Net Positive Suction Head Required)

Net positive suction head required is the minimum amount of pressure or force of energy that is required at the suction port (inlet) to overcome the losses from friction that are caused between the suction head/nozzle (inlet) and the eye of the impeller, without causing vaporization (cavitation) of the liquid being pumped.

• Best Efficiency Point

Every pump has a best efficiency point (BEP) and many pump curves will clearly show the BEP.  BEP is the rate of flow and the total head at which a pump efficiency is at a maximum at a given motor speed and impeller diameter.

BEP is a combination of the head/flow rate as it corresponds to the highest efficiency. BEP directly corresponds to the input horsepower of the motor required to drive the pump and the horsepower created by the flow of water created by the pump.

For a pump to be 100% efficient the input horsepower needed would be equal to the water horsepower being created.  No pump is capable of 100% efficiency and as a result every pump will require more horsepower input from the motor than it is capable of generating in water horsepower. 

Think of the BEP as what a baseball player would refer to as the “sweet spot” of the bat!  Studies have shown that by operating within the BEP, the pump/motor life is extended.  This not only minimizes the cost of repairs, maintenance, and replacement, but also the costs incurred during a down time of production for a pump that is no longer operational.

• Preferred Operating Range (POR)

Referred to as the preferred operating range or preferred operating region.  A pump will run best the closer it is to the BEP.  For this reason, The Hydraulic Institute has determined that the preferred operation range as it pertains to water flow is between 70%-120%.  Most manufactures will recommend a POR that is between 80% and 110% as operation in the POR has direct implications on the life of the pump as well as power consumption. 

Pump manufactures give a variety of information on their pump curves.  Some are more detailed than others.  However, most manufacturers will offer more detailed specs, requirements, additional curves, etc. in their product manuals.  But the most basic information that the average consumer needs typically boils down to 2 items: Total Pump Head & Gallons Per Minute

Reading a Pump Curve 

Let’s look at an example situation to help you pick out the right pump for your application using just pump head and gallons per minute to help us come to a decision on the right pump.

Situation #1:  You are replacing an old pump that already has the pipes in place that are 2” going into the pump and 2” going out.  The old pump is pumping water from a 5,000 gallon tank and pumping the water to a second tank that is 50 feet above the first tank.  Your old pump was pumping approximately 100gpm (gallons per minute) and you would like to try to get a pump that will perhaps get you to 150gpm due to increased production demands.

So we can determine the following:

• You need a pump with a 2” inlet diameter and a 2” outlet diameter
• You have a minimum pump head of 50 feet
• You would like a pump that will give at least 150gpm

Looking at the pump curve below, which of the following 2” pumps will work for your application?

Step #1: Start with your required pump head (50 feet) on the left-hand side of the curve

• We can see that pumps A & B are below our required head, so we can rule them out.
• We now have 3 pumps on this curve that meet our total pump head requirement of 50ft.

Step #2: Determine which pump is capable of 125gpm or more

• From the left of the curve, starting at 50ft, draw an imaginary line to the right.
• Then follow each pump curve down towards the GPM.
• We can see that pump D will give us the 50 feet of head we require but will only give us 110gpm.  It’s probably similar to the pump you are replacing.
• Pump E will meet our 50ft head requirement (it’s capable up to 75ft) and at 50ft head it will give us 145gpm.  Pump F at 50ft of head will give us 180gpm.

Step #3: Decision Time!

You have 3 pumps to choose from that meet your requirements but you still have a few things to consider:

• Pump D:
  • Pro: similar to the pump you are replacing
  • Con: no real increase in performance in GPM (110gpm total)
  • Pro: guaranteed to be lower cost than pumps E & F
• Pump E:
  • Pro: increase of 45gpm compared to your old pump (145gpm total)
  • Pro: gets you close to your desire of 150gpm
  • Con: 5gpm lower than your 150gpm goal
  • Con: higher price than pump D
• Pump F:
  • Pro: increase of 80gpm compared to your old pump
  • Pro: 35gpm greater than pump E
  • Pro: gets beyond your desire of 150gpm (180gpm total)
  • Con: higher price than pumps D & E 

Conclusion

As you can see there are many considerations to look at when picking out a pump.  And we only looked at one example and a simple one at that!

While there is a lot of information available to you, the consumer, finding the most basic information is not as hard as one would think.  Just remember, the best thing to do is to ask an expert if you are not sure!  But now that you know the most basic details as you look at a pump curve, you will be better prepared to make the best decision on the right pump.

At Absolute Water Pumps we would be more than happy to answer any questions you have as you look for the perfect pump! Feel free to give us a call at 1-888-264-2189 for any of your water pump needs. 

At Absolute Water Pumps, we know transparency is important. We’re proud to provide our customers with as many made-in-America water pumps as we can. Perhaps now more than ever, consumers are concerned with where and how their products are being made. Do companies have manufacturing facilities in China? The Philippines? The United States of America? Do they make responsible and ethical business decisions? We’re happy to partner with a number of made-in-America water pump manufacturers, and we believe our clients should know exactly where and who is making your water pump systems.

Gorman-Rupp Company

Founded in 1934, Gorman-Rupp is one of the leading and largest manufacturers of water pumps in the United States. With just over 1,000 employees, the produce more than 4,000 pump models. Your water pump is made in facilities making up over one million square feet of manufacturing space. Most of Gorman-Rupp’s water pumps are made in the headquarter city, Mansfield, Ohio, or in another facility located in Bellville, Ohio; Sand Springs, Oklahoma; Toccoa and Chamblee, Georgia; Royersford, Pennsylvania; or, in one of two international facilities located in St. Tomas, Ontario and County Westmeath, Ireland. 

Gorman-Rupp specializes in electric centrifugal pumps and engine centrifugal pumps. 

Gorman-Rupp Electric Centrifugal Pumps	Gorman-Rupp Engine Centrifugal Pumps

AMT and Patterson 

AMT and Patterson Pumps are both subsidiaries of the Gorman-Rupp Company. For over 70 years, AMT has been selling their products under its own as well as under distributor-branded names to some of the largest industrial distributors in the country. Their headquarters is located in Royersford, Pennsylvania, and nearly every product from AMT is engineered, designed, machined, assembled, and tested at the facility in Royersford. 

AMT specializes in electric centrifugal pumps and electric submersible pumps. 

AMT Electric Centrifugal Pumps	AMT Electric Submersible Pumps

NorthStar 

NorthStar water pumps are manufactured by Northern Tool + Equipment, a family owned and operated company that’s been in the business of producing reliable tool and home equipment for over 35 years. Don Kotula, the company’s founder and owner grew up between Hibbing and Chisholm in Minnesota’s Iron Range. It was there he developed his make-it-yourself mentality that guided him to founding Northern Tool + Equipment. 

In 1981, Kotula and his family opened their first store in Burnsville, Minnesota. What couldn’t be purchased from suppliers was made on their own, in their shop. Today, he works with his two sons, Ryan and Wade, as well as thousands of employees who are just as invested in bringing useful products at a great price to customers who need to tackle tough challenges. Thanks to Kutola’s insistence on family-owned and American made, you can find over 40,000 Northern Tool + Equipment products in over 90 stores in the USA.

NorthStar specializes in semi-trash pumps and trash pumps. 

NorthStar Semi-Trash Pumps	NorthStar Trash Pumps

Motor type is an important but often overlooked feature when selecting a centrifugal electric water pump. Heat and contamination are the two main factors that cause a centrifugal pump's electric motor to decrease in performance, or worse, fail. The ways in which a electric motor is protected against heat and contamination make a big difference in the life span of your equipment. 

There are seven types of NEMA standard motors. For the sake of our conversation, we're going to focus on the two most popular types: 

1. Open Drip Proof (ODP)

2. Totally Enclosed Fan Cooled (TEFC)

An ODP motor's housing features stamped vent openings to create airflow around the windings, which in turn cools the motor. The vents are strategically placed around the pump to try to direct water or moisture from landing on the windings of the motor. This design of an electric motor is fine for air flow in and around the motor, but does not keep dust and contaminants from getting around the windings which can cause the motor to overheat or fail. An ODP motor is less expensive to purchase and is recommended for use in more sterile environments that are free from moisture, dust, and other contaminants. 

TEFC motors have an enclosure that keeps oustide air from circulating inside of the motor. An external fan is mounted outside the frame to blow air around the enclosure to keep the windings cool. This type of motor is recommended for most industrial applications. A TEFC motor is effective in protecting the electric motor against moisture and contaminants that can degrade the windings. For outdoor use, we recommend an additional protective cover be used to keep rain and debris from falling directly on the motor. 

Your electric motor type should match the environment in which the water pump will be operating. Over the years, the industry has transitioned to TEFC motors since the design is more successful in protecting the motor, which means longer life for your pump at a reasonable premium in cost – about $50.00 a pump. 

At Absolute Water Pumps, we want to help you get the right pump with the right motor type for your application. We carry hundreds of quality AMT Gorman-Rupp electric pump models in both ODP and TEFC motor types. 

The flow of electricity is like the flow of water in your water pump. The voltage is similar to pressure and amperage is similar to gallons per minute. Resistance in the wire is similar to the friction loss in a pipe. These values can be combined in both series and parallels to achieve the desired effect. A hole in a pipe causing a leak is similar to a ground fault which leaks electricity. Wattage or load is similar to flow and pressure combined, and measured in watts. There may be similarities, but there's one big difference: a hole in a water pipe will get things wet, but a hole in insulation can result in an electrical shock hazard. 

One important difference between water and electric systems is that an electrical system is closed – that is, the flow of a current should never lleave the system. If it does leave the system, that's called a ground fault. A water system, however, is open. In most cases, we discharge the water and it leaves the system. 

In your water pump motor's electrical system, the AC voltage will be in the form of alternating voltage. Most residential power is single phase, which is typically indicated by the single sine wave, with a voltage alternating between a positive 120V to negative 120V, 60 times a second. This form of power allows us to raise or lower the power with a transformer which isn't possible with DC electricity. 

Three phase power is used in variable speed drives and industrial applications. This power has 3 sine waves, all 120 degrees out of phase with each other and alternating positive to negative just like the single phase. Besides the simplicity of three phase, the motor requires less copper wire to carry the same amount of wattage as single phase. Voltage is the amplitude of the electricity measured in volts. Most voltage at the site in North America is 120, 240, 480, and 600. The higher the voltage, the less copper wire needed to supply the same amount of power to the load. Power loss in the wire is dependent on the voltage and wire size, which will become resistance for the current. This is the reason power lines throughout the country are high voltage, sometimes as high as 765,000V. 

For example, say you change 120V to 240V through the same wire, we'll have twice the wattage capability at the other end. The motor unlike a resistive load draws higher amps at both high and low voltage relative to the voltage rating of the motor. In a resistive load, the higher the voltage, the lower the amps. By reading the voltage going to the motor, we can tell if the voltage is adequate for the motor to run. We'll cover this below when we discuss meters in more depth. 

As voltage passes through an object, there's a drop in th voltage due to resistance. This is true for AC and DC. A set of contacts in a switch will show a minor drop across them when closed, and full voltage reading when open. This fact can be used to test overloads to see if they're open or closed when power is being supplied. 

With multiple loads and series, the loads will share the voltage, and depending on the proportions of the loads, the voltage could be half on each load. 

Consider a series of switches where you apply multiple switches to control or power a device. If either of the switches is open, the circuit will not be energized. The load will not be energized unless both switches are closed. This may be applied to a pressure switch and float switch when the tank is calling for water. The pressure in the line indicates the pressure is satisfied, and even though the tank is empy, the pump won't run at this time. 

Another scenario would be that the float switch is saying the tank is full, but the pressure switch sees low pressure and tries to run the pump. The pump won't run unless both switches are closed. Now as an example, consider an illustration of parallel switches where you apply multiple switches to control or power a device. When both of the switches are open, the circuit will not be energized. This may be applied to two float switches in a tank where we want to use up most of the tank before we refill, and have both switches open before we shut the tank down. This is an example of switch priority and can be combined with series switches on one or both sides to make sure all desired priorities are met. 

Measuring With the Right Meter

When troubleshooting pumps and motors, meters are critical to analyzing what's going on at your jobsite. A voltometer, clamp on amp meter, and a megger are all necessary meters to troubleshoot, whether your pump is single or three phase. 

Volts are measured with a voltometer. To use the meter, turn it on and turn the knob to the "V" with a wavy line, indicating alternating voltage. With most digital meters, you don't have to worry about the range since they automatically adjust. Accurate readings are important, so keep your meter calibrated on a routine basis. 

To measure the amps in a wire, the best instrument is a clamp tight meter, which can read most currents without damaging the meter. This meter doesn't have to be wired into the circuit – you simply clamp the meter around the wire you want to measure. 

Using a voltometer to read resistance int he best way to check motor windings and wire. To operate the meter, turn the knob to the upside down horseshoe. Once again, most meters will auto-range, so you don't have to figure out where to set the range. When checking a circuit, make sure the power is off, and the capacitors have drained of voltage or the meter may be damaged.

The meter has to have the capability to read the value you're looking for. Know what your meter can do before attempting to take any readings. If the meter isn't capable of the value you're looking for, the reading may mislead you to a wrong conclusion. 

When testing for a ground fault or failure of insulation, a megger is a must. To test insulation on a wire motor, voltage higher than the voltometer can provide is needed. Many pump manufacturers recommend tests be run at 1000V. To run the test, hook your test leads between the power leads you want to check and the green ground wire. The reading may be in millions of ohms since the test voltage is 1000V. Use the alligator clips to hold the test leads to the wires. A ground fault is more than a problem with the system – it's a danger to the user. 

Electrical Relationships

The longer the wire, the greater the resistance. Therefore, the greater need for larger wire. In conclusion, remember that the balance of voltage and amperage in the circuit will ensure a long and proper life to the motor. 

Last month we welcomed Thompson Pumps to our catalogue of reliable, workhorse water pumps. Thompson Pumps is a family owned manufacturer of water pumps that are ideally suited for a number of industries including construction, municipal and public works, mines, pits, and quarries, oil and gas, emergency response, environmental remediation, and agriculture. Their pumps range from two to eighteen inches and span six families of pump type, but today we'll feature two of those we offer on Absolute Water Pumps, the Thompson Self-Priming Trash Pump and the Thompson High Pressure Solids Handling Compressor-Assisted Dry Prime Jet Pump. 

Thompson Pumps for Construction

These pumps are built for the most rugged and tough construction applications. These heavy-duty machines are capable of handling equipment washdown, force main pumping, groundwater removal, excavation dewatering, sewer bypass, slurry transfer, slurry wall, water supply, wellpoint dewatering and installation, and more. 

Thompson Pumps for Emergency Response

Your Thompson Pump is prepared, experienced, and ready. Thompson pumps have been present in cleaning up catastrophic disasters like Hurricane Katrina, 9/11, the Exxon Valdez Oil Spill, and Superstorm Sandy. An emergency is already a worrisome and costly disaster, so make sure you're secured with a powerful, reliable water pump from Thompson. Some of the specific emergency applications for a Thompson pump include flood dewatering, temporary fire suppression, water supply, filtration, recovery of hazardous materials, and more. 

Thompson Pumps for Agriculture

With a high volume, high pressure pump from Thompson, you no longer have to hesitate about completing those big farm jobs. Perfect for water transfer, irrigation, and dust abatement, Thompson's heavy-duty, end-suction centrifugal pumps are reliable every time, and feature an Enviroprime System which is automatically primed and provides the environmental advantage of not spilling pump fluids on the ground. 

Thompson 6HT-DIS-4LE2T Self-Priming Trash Pump

The Thompson 6HT model is Final Tier 4 certified. Its heavy-duty cast-iron construction is able to self-prime and re-prime automatically. Flow rates of up to 1,430 GPM, heads around 104 feet, and handles solids up to 3". This Thompson pump outperforms many other centrifugal trash pumps on the market, and they cost less to operate. Operating on an Isuzu 4LE2T engine, this diesel workhorse can run for 26.16 hours. 

Thompson 4JSCM-DIS-4LE2T-M High Pressure Solids Handling Compressor-Assisted Dry Prime Jet Pump

This model from Thompson Pump is an even bigger workhorse with an engine run time of 34.70 hours. The 4JSCM has an electric starting system, inlet and outlet diameters of 4", can pump 1,200 GPM, offers heads around 132 feet, and handles solids up to 3". This automatic self-priming and re-priming dry pump provides 40P, a 58 gallon fuel capacity, and only consumes 1,67GPH at 2,200 RPM. 

Did you know centrifugal pumps make up 85% of most water pump designs? We're excited to release a new self-priming AMT centrifugal 4" pump, but first, a little more information on just how those centrifugal pumps work. 

A centrifugal pump uses centrifugal force to generate pressure and flow. The pump pulls water into the eye of the impeller, then spins the water to force it the outer edge of the impeller. The amount of flow and pressure is only limited by the size of your impeller, the material strength, and speed of rotation.

Centrifugal pumps can be used as a single or multiple stage pump. Each stage has its own impeller. The impellers can also be used in a series, which means larger amounts of pressure can be generated at the required flow rate. When the pump is hooked up in a series or parallel, this allows the pressure or flow to increase. The case pressure capabilities must be noted to be sure the sum of the pressure does not exceed your case pressure capability. 

So if centrifugal pumps make up 85% of all water pumps designs, what sorts of pumps could you find with the centrifugal pumping mechanism? Just a few include jet pumps, sump pumps, sewage pumps, and utility pumps. You can click to shop all centrifugal pumps offered by Absolute Water Pumps. 

What’s the use? 

When you have a centrifugal water pump, you can use the pump for: 

• transferring water
• supplying water for irrigation 
• supplying water for equipment 
• your business
• your home 

Where does the energy come from? 

Centrifugal pumps can be powered by electric motors, gas or diesel engines, power take-offs from tractors, or any other rotary force than spins the impeller in order to move water. Most impellers are attached to direct power sources, but they can also be remotely attached to the pump by the rotary shaft. 

What makes up my centrifugal pump? 

There are two working parts to your pump: the impeller and the volute. The impeller imparts connective energy to the liquid being pumped. The volute gives the direction and control to the liquid.  

Then you have the pump case. Your pump case fills with water, which is called priming. When the impeller turns and forces water to the outside circumference, the water moves towards the pump’s discharge. As the water moves. a vacuum is formed at the eye of the impeller, which causes more water to move into the impeller. 

The vacuum creates a pressure differential with outside atmospheric pressure. With the atmospheric pressure greater inside the pump, the outside pressure pushes a continuous flow of liquid into the pump. As you increase your altitude, your atmospheric pressure decreases. 

So what’s that thing about priming? You can “prime” or “lose prime.” When you lose prime, it means your centrifugal pump’s impeller is pulling in air. If that happens, pressure can’t be created. Think about it this way: if you’re drinking soda through a straw, and you take your lips off the straw, air will enter and the soda will fall back into your cup.  

Then there’s the idea of “self-priming,” which is not exactly correct. The major difference between straight end suction and self-priming is the location of the suction opening. When you have a self-priming pump, the suction and discharge ports are above the eye of the impeller. A self-priming pump is really a “prime-it-once” pump. 

Now what about altitude? Altitude is very important when considering a new centrifugal pump purchase. If a pump is pumping from a positive suction of flooding suction, you have a booster pump. If it’s below, it’s referred to as a negative suction lift. With a negative suction lift, there’s a practical limit at sea level of 25 feet. By design, some pumps cannot lift water with a suction of 25 feet. Be sure to note your pump’s limitations. 

The limitations are set by the sum total of elevation change, friction loss, and altitude of location. Limitations are based on atmospheric pressure and properties of the fluid being pumped. As you increase altitude, the ability to lift water from the source changes.  

Now, to introduce our brand new AMT Self-Priming 4” Centrifugal Pump. This pump is designed for a wide range of high capacity applications which include: 

• liquid transfer
• dewatering
• circulation
• irrigation
• drainage 

The dual volute design reduces the radial load on your motor, and the centerline discharge feature is especially designed to prevent vapor binding, which makes for convenient piping connections. All models of this pump feature a self-cleaning, semi-open stainless impeller, which handles semi-solids up to a 1/2” in diameter. Built-in check valves for fast priming are standard on all units. Fill and drain plugs for easy installation and servicing. 

Here are the features we love about the AMT 4” Self-Priming Centrifugal Cast-Iron Pump: 

• Cast iron construction with stainless steel impeller
• Buna-N mechanical seal, check valve, O-ring 
• Optional silicon carbide seal available 
• 4” NPT suction and discharge ports 
• Maximum solids handling of 1/2” 
• Maximum temperature of 180 degrees F
• Maximum flow: 660 GPM
• Maximum head: 114 feet
• Self priming to 20 feet 
• Self-cleaning, semi-open impeller
• 10 to 15 HP TEFC single and 3-phase motors 
• Optional mounting base available 

A few months ago, we gave you a crash course in crash course in submersible shredder sewage pumps. When you need to transport liquids with high solid content or sludgey materials through hoses or pipes, those materials need to be shredded. If you try to move these materials through a normal pump, you risk the solids getting stuck in the discharge apparatus, or worse, eroding the hardware of your pump. If you need to filter or grind fibrous materials, an AMT submersible shredder sewage pump will help you do so efficiently and safely without wearing down or damaging your pump. 

AMT 5761-95

This industrial grade sewage pump offers a continuous duty, single phase electric motor and is designed with cast-iron construction and stainless steel motor housing in order to handle sludge and dirty water applications. To prevent clogging, AMT features an enhanced spiral shredder mechanism plate and carbide tipped impeller. 

AMT 5764-95

As will all AMT submersible shredder pumps, liquid content must remain above 85% to keep from damaging the pump and possibly voiding your warranty. The 5764-95 model can handle solids of up to 1.1 inches and offers a 2HP continuous duty 3-phase electric motor. 

AMT 5765-95

This 16 Amp/230 Volt continuous duty, single-phase electric motor allows solids of up to 1.1 inches, provides a triplex seal system, and a 4" output port with an impressive discharge rate of 14,400 gallons/hour. The 5765-95 model provides operators with a carbide tipped impeller and double carbide mechanical seal material. 

As you can see in the charts above, the main factors in deciding which model of AMT Submersible Shredder Sewage Pump is best for you means considering:

1. Outlet Size
2. PSI
3. Discharge Rate
4. Max Total Head

Depending on how much sludgey water you need to move and how fast, AMT has created a versatile line of shredder pumps so you can clean up your work zone as fast, as safely, and as efficiently as possible. If you have more questions about what type of submersible water pump is right for your application, contact an Absolute Water Pumps specialist. 

Subaru ensures the highest level of reliability and performance with state-of-the-art engines and industry-leading generator technology. Subaru's water pumps are built to the highest quality with features that meet any application need for contractors, homeowners, and do-it-yourselfers. No matter what type of Subaru water pump you choose, your machine will be equipped with an industry-leading industrial engine and construction grade features so your pump will start easily, require low maintenance, and provide you with longer engine life. 

Subaru RPS-65011

The RPS-65011 subermsible pump's tough aluminum housing and nylon impeller provide you with efficient and rugged power in a lightweight frame. Thanks to the Subaru powered electric motor, this pump runs continuously until the job is done. Clear water projects are no problem. 

Subaru PKV-110

The PKV-110 provides fast, mobile, centrifugal pumping quality. This pump requires initial priming. Model includes hose band, coupling strainer, and tool kit. Ideal for pools and small projects, this pump has a 12-pound durable frame and can remove over 1,600 gallons of water in an hour on less than one gallon of gas. 

Subaru PKX220ST

The PKX220ST works great in clean and slightly dirty water – low mud or sand in your worksite won't cause you any problems. This pump features a 4.3HP Subaru engine, 2.1 hours of continuous run time, and moves water at a rate of 180 gallons/minute. Model includes tool kit, coupling, strainer, and hose band. 

Subaru PTX301D

The PTX301D can power through nearly 8,000 gallons of water on less than a gallon of gasoline. Ideal for abrasive and/or viscous products, shallow depths, slow seepage, and slurry water. This pump features a hermetically sealed compression chamber which provides positive displacement, preventing loss of gases or liquids. The PTX301D can pass solids of up to 1.3 inches. 

Subaru PKX201H

The PKX201H comes standard with a .95 gallon fuel tank and strainer, tool kit, hose coupling, and hose band. Your 6HP Subaru engine with speed control can remove 7,620 gallons of water/minute. This model offers 2.5 hours of continuous run time.