For Use With For Use With |
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Maximum Pressure Maximum Pressure |
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Power Source Power Source |
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Maximum Discharge Pressure Maximum Discharge Pressure |
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Pump Type Pump Type |
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Piston Material Piston Material |
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Maximum Feet of Head Maximum Feet of Head |
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Housing Material Housing Material |
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Maximum Flow Rate Maximum Flow Rate |
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Maximum Temperature Maximum Temperature |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Pump Style Pump Style |
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Intake Connection Type Intake Connection Type |
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Duty Cycle Duty Cycle |
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Discharge Connection Type Discharge Connection Type |
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Priming Type Priming Type |
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Discharge Thread Type Discharge Thread Type |
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Intake Gender Intake Gender |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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How to Prime Your Pump
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How to Determine Feet of Head
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About Process Pumps
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Self-Priming Circulation Pumps without Motor for Oil

Use these pumps to move lubricating oil such as hydraulic and motor oil. Also known as flexible impeller pumps, they create a suction force that can draw liquid upward to fill the pump chamber when your liquid source is below the pump. The impeller resists clogging and wear. Select a spark-free air motor for hazardous environments or attach an electric motor with a speed reducer or a belt pulley to alter the pump speed.
Repair kits (sold separately) include components such as impellers, O-rings, and seal lips.
Note: Pumps must be filled with liquid before use. They need a constant flow of liquid and cannot run dry.
Intake (NPT) | Discharge (NPT) | Shaft | Overall | ||||||||||||||
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Max. Flow Rate, gpm | Max. Ft. of Head, ft. | Max. Pressure, psi | Max. Viscosity | Temp. Range, °F | Required hp | Gender | Pipe Size | Gender | Pipe Size | Dia. | Lg. | Ctr.-to-Base Lg. | Ht. | Lg. | Wd. | Each | |
For 500 rpm-2,100 rpm Motor Speed | |||||||||||||||||
11.5 | 50 | 21 | Not Rated | 50° to 180° | 1/3 hp | Female | 1/2 | Female | 1/2 | 5/8" | 1 1/8" | 1 15/16" | 3 13/16" | 4 1/2" | 4 1/8" | 0000000 | 0000000 |
25 | 50 | 26 | Not Rated | 50° to 180° | 3/4 hp | Female | 1 | Female | 1 | 5/8" | 2 1/4" | 1 7/8" | 3 9/16" | 6 3/8" | 4 3/4" | 0000000 | 000000 |
Air-Powered Constant-Flow-Rate Pumps

Commonly called piston pumps, these are often used in high-pressure applications, such as hydrostatic testing of pipelines, tanks, and valves. Flow and outlet liquid pressure can be controlled by varying the air pressure. To calculate discharge liquid pressure, multiply the air pressure by the ratio shown in the table. Pumps are self-priming, which means they create a suction force to draw liquid upward to fill the pump chamber.
Note: Pumps must be filled with liquid before use. They need a constant flow of liquid and cannot run dry.
For technical drawings and 3-D models, click on a part number.
Flow Rate, gpm | Air Pressure, psi | Overall | ||||||||||||
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@ 0 psi | Max. ft. of Head | Max. Discharge Pressure, psi | Max. Viscosity, cP | Min. | Max. | Air Consumption, scfm | Air Connection (NPT) | Intake Pipe Connection (NPT) | Discharge Pipe Connection (NPT) | Lg. | Wd. | Ht. | Each | |
11:1 Discharge Liquid to Inlet Air Pressure Ratio | ||||||||||||||
4.76 | 3,679 | 1,595 | 100 | 15 | 145 | 45 | 1/2 Female | 1 Female | 1/2 Female | 10 3/4" | 7" | 12 1/4" | 0000000 | 000000000 |