Self-Priming Gear Pumps | McMaster-Carr

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About Process Pumps

Mount these pumps in any position, even upside down. Pumps have a subfractional horsepower motor rated for intermittent use (return to room temperature before restarting). Also known as diaphragm pumps, they are for use in low-flow spraying, draining, and washdown applications. They are self-priming, which means they create a suction force to draw liquid upward. Pumps can run dry and do not require an initial fill, so they’re a good choice for applications without a constant flow of liquid. Do not use with solids.

Battery-operated pumps operate on a 12-volt battery. They are commonly used with agricultural sprayers and washers.

Pumps with a pressure switch automatically shut off the pump at the maximum pressure.

For technical drawings and 3-D models, click on a part number.

							Intake			Discharge				Overall
	Max. Flow Rate, gpm	Flow Rate @ Pressure	Max. ft. of Head	Max. Pressure, psi	Max. Temp., °F	Current, A	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Max. Self-Priming Ht., ft.	Lg.	Wd.	Ht.		Each
120V AC, Single Phase—With Thermal Overload Protection and With Pressure Switch
Hardwire
A	1.5	1.24 gpm @ 20 psi (46 ft. of head), 1.04 gpm @ 60 psi (138 ft. of head)	346	150	170°	1	3/8	NPT	Female	3/8	NPT	Female	8	9 3/8"	3 3/8"	4 1/8"	0000000	0000000
Plug
A	1.4	1.15 gpm @ 20 psi (46 ft. of head), 0.84 gpm @ 60 psi (138 ft. of head)	138	60	130°	0.57	3/8	NPT	Female	3/8	NPT	Female	8	7 5/8"	3 3/8"	4 1/4"	0000000	000000
A	1.6	1.32 gpm @ 20 psi (46 ft. of head), 1.07 gpm @ 60 psi (138 ft. of head)	231	100	170°	0.95	3/8	NPT	Female	3/8	NPT	Female	8	8 5/8"	3 3/8"	4"	0000000	000000
A	1.7	1.52 gpm @ 20 psi (46 ft. of head), 0.03 gpm @ 60 psi (138 ft. of head)	138	60	170°	0.61	3/8	NPT	Female	3/8	NPT	Female	8	8 5/8"	3 3/8"	4"	0000000	000000
A	3	2.20 gpm @ 20 psi (46 ft. of head)	104	45	120°	0.7	1/2	NPSM	Male	1/2	NPSM	Male	8	8 3/4"	5"	4 1/2"	0000000	000000
120V AC, Single Phase—With Thermal Overload Protection
Plug
A	3.4	2.30 gpm @ 20 psi (46 ft. of head)	92	40	120°	1	1/2	NPSM	Male	1/2	NPSM	Male	8	7 5/8"	5"	4 3/8"	0000000	000000
12V DC—With Thermal Overload Protection and With Pressure Switch
Hardwire
B	5.3	4.30 gpm @ 20 psi (46 ft. of head), 3.40 gpm @ 60 psi (138 ft. of head)	120	60	140°	17	1/2	NPSM	Male	1/2	NPSM	Male	8	10"	4 15/16"	4"	0000000	000000
12V DC—Without Thermal Overload Protection and With Pressure Switch
Hardwire
A	1.8	1.45 gpm @ 20 psi (46 ft. of head), 1.22 gpm @ 60 psi (138 ft. of head)	231	100	170°	8.7	3/8	NPT	Female	3/8	NPT	Female	10	8 3/8"	4"	4 1/8"	0000000	000000
A	1.8	1.57 gpm @ 20 psi (46 ft. of head), 1.23 gpm @ 60 psi (138 ft. of head)	138	60	170°	7.2	3/8	NPT	Female	3/8	NPT	Female	12	8 3/8"	4"	4 1/8"	0000000	000000
A	3	2.69 gpm @ 20 psi (46 ft. of head)	115	50	170°	8	1/2	NPSM	Male	1/2	NPSM	Male	8	8 5/8"	5"	4 1/2"	0000000	000000
A	3.5	2.56 gpm @ 20 psi (46 ft. of head)	115	50	130°	9.9	1/2	NPSM	Male	1/2	NPSM	Male	9	8 5/8"	5"	4 1/2"	0000000	000000

Continuous-Duty Any-Direction Constant-Flow-Rate Pumps for Water and Coolants

Rated for continuous use, this pump is often used to move caustics such as antifreeze and salt water. Mount it in any position, even upside down. Also known as a diaphragm pump, it is typically used for low-flow spraying, draining, and washdown applications. Pump has a pressure switch that automatically shuts off the pump at the maximum pressure. It is self-priming, which means it creates a suction force to draw liquid upward. Pump can run dry and does not require an initial fill, so it’s a good choice for applications without a constant flow of liquid. Do not use with solids.

							Intake			Discharge			Overall
Max. Flow Rate, gpm	Flow Rate @ Pressure	Max. Pressure, psi	Max. Viscosity, cP	Max. Temp. Range, °F	hp	Current, A	Tube Connection Type	Gender	For Tube ID	Tube Connection Type	Gender	For Tube ID	Lg.	Wd.	Ht.		Each
120V AC, Single Phase—With Thermal Overload Protection and Pressure Switch
Plug
3	2.50 gpm @ 20 psi (46 ft. of head)	40	250	130°	3/16	1.8	Barbed	Male	1/2"	Barbed	Male	1/2"	10 7/8"	5 3/8"	5 5/8"	0000000	0000000

Constant-Flow-Rate Pumps for Water

Also known as gear pumps, these produce a smooth flow of liquid for applications such as cooling engines, powering hydraulic equipment, and extracting liquid from holding tanks. Pumps are self-priming after you fill the pump chamber with liquid. As liquid in the chamber is expelled, a suction force is created which allows the pump to draw liquid upward. Do not use with solids. Pumps can be used in dusty, dirty, and damp environments.

Pumps that cannot be sold to Canada are restricted by local energy efficiency requirements.

Note: Pumps must be filled with liquid before use. They need a constant flow of liquid and cannot run dry. If flow control is needed, place valves or reducers on the discharge side; never restrict the inlet of a pump with a valve or reducer.

For technical drawings and 3-D models, click on a part number.

						Intake (NPT)		Discharge (NPT)			Overall			Chemical Resistance
Max. Flow Rate, gpm	Discharge Pressure, psi	Max. Viscosity, cP	Temp. Range, °F	hp	Current, A	Pipe Size	Gender	Pipe Size	Gender	Motor Enclosure Type	Lg.	Wd.	Ht.	Cannot Be Sold To		Each
115/230V AC, Single Phase—Without Thermal Overload Protection
Hardwire
2.1	150	100,000	32° to 140°	1/2	7.4/3.7	1/4	Female	1/4	Female	Totally Enclosed	16 1/16"	8 3/16"	8"	__	0000000	000000000
8.5	150	100,000	32° to 140°	1	12.8/6.4	1/2	Female	1/2	Female	Totally Enclosed	18 1/8"	9 3/16"	9"	__	0000000	00000000
230/460V AC, Three Phase—Without Thermal Overload Protection
Hardwire
10.2	150	100,000	32° to 140°	1 1/2	4.4/2.2	1/2	Female	1/2	Female	Totally Enclosed Fan Cooled	19 13/16"	9 5/16"	7 1/4"	Canada	0000000	00000000
23	150	100,000	32° to 140°	3	8.4/4.2	1	Female	1	Female	Totally Enclosed Fan Cooled	25 1/8"	10 5/16"	9 1/16"	Canada	0000000	00000000

Constant-Flow-Rate Pumps without Motor for Oil

A cast iron housing and steel gears allow these pumps to be used to dispense oil and fuel such as hydraulic oil and diesel fuel. Select your own motor to tailor them to your application. Use an air or electric motor with a coupling and belt/pulley drive. Also known as gear pumps, they produce a smooth flow of liquid for applications such as engine lubrication. All are self-priming, which means they create a suction force to draw liquid upward and fill the pump chamber. Do not use with solids.

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.

				Required hp		Intake			Discharge			Overall			Shaft
Max. Flow Rate @ 25 psi, gpm	Max. Flow Rate, gpm	Max. ft. of Head	Max. Viscosity, cP	@ 25 psi	@ 100 psi	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Lg.	Wd.	Ht.	Dia.	Lg.	Center-to-Base Lg.		Each
8.9	9	462	20,000	3/4	1	1/2	NPT	Female	1/2	NPT	Female	7 1/4"	3 7/16"	4 1/2"	5/8"	1 9/16"	3"	00000000	000000000

Constant-Flow-Rate Pumps without Motor for Water

These pumps have a bronze housing and gears for use with water. Select your own motor to tailor them to your application. Use a NEMA 56C frame electric motor with a coupling and belt/pulley drive. Also known as gear pumps, they produce a smooth flow of liquid for water delivery. All are self-priming, which means they create a suction force to draw liquid upward and fill the pump chamber. Do not use with solids.

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.

				Required hp		Intake			Discharge			Overall			Shaft
Max. Flow Rate, gpm	Max. Flow Rate @ 25 psi, gpm	Max. Ft. of Head, ft.	Max. Viscosity, cP	@ 25 psi	@ 100 psi	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Lg.	Wd.	Ht.	Dia.	Lg.	Ctr.-to-Base Lg.		Each
For 1,725 rpm Max. Motor Speed
2.1	1.8	345	17,300	1/8	1/4	1/4	NPT	Female	1/4	NPT	Female	6 3/16"	2 1/2"	3"	1/2"	1 13/16"	1 7/8"	000000	0000000
4.2	4	345	17,300	1/4	1/2	1/4	NPT	Female	1/4	NPT	Female	5 3/4"	3"	3 11/16"	1/2"	1 13/16"	2 3/8"	0000000	000000
10.6	10.2	345	17,300	3/4	1 3/4	1/2	NPT	Female	1/2	NPT	Female	6 7/8"	3 3/4"	4 1/4"	5/8"	2"	2 3/4"	0000000	000000
19.8	19	345	17,300	1 1/2	2 3/4	3/4	NPT	Female	3/4	NPT	Female	7 1/16"	4 3/8"	5 1/4"	5/8"	2 3/16"	3 9/16"	0000000	000000
23.5	22.2	345	17,300	1 1/2	2 3/4	1	NPT	Female	1	NPT	Female	7 5/16"	4 5/16"	5 1/4"	5/8"	2 3/16"	3 9/16"	0000000	000000
For 1,750 rpm Max. Motor Speed
7.2	7	345	17,300	3/4	1 1/2	3/8	NPT	Female	3/8	NPT	Female	6 9/16"	3 3/4"	4 1/4"	5/8"	2 1/16"	2 3/4"	0000000	000000

Constant-Flow-Rate Pumps without Motor for Chemicals

With a 316 stainless steel housing and stainless steel gears, these pumps are often used to dispense chemicals such as ethylene glycol, isopropyl alcohol, and nitric acid. Use an electric motor with a coupling and belt/pulley drive. Also known as gear pumps, they produce a smooth flow of liquid. All are self-priming, which means they create a suction force to draw liquid upward and fill the pump chamber. Do not use with solids.

For technical drawings and 3-D models, click on a part number.

					Required hp		Intake (NPT)		Discharge (NPT)		Overall			Shaft
Max. Flow Rate @ 25 psi, gpm	Max. Flow Rate, gpm	Max. ft. of Head	Max. Pressure, psi	Max. Viscosity, cP	@ 25 psi	@ 100 psi	Pipe Size	Gender	Pipe Size	Gender	Lg.	Wd.	Ht.	Dia.	Lg.	Center-to-Base Lg.		Each
4.3	4	346.3	150	20,000	1/4	3/4	1/2	Female	1/2	Female	6 1/4"	3"	3 3/4"	1/2"	1 1/4"	2 5/8"	00000000	000000000
10.2	10	346.3	150	20,000	1/2	1 1/2 hp	3/4	Female	3/4	Female	7 1/2"	3 3/8"	4 3/8"	5/8"	1 3/4"	3"	00000000	00000000

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.

For technical drawings and 3-D models, click on a part number.

						Intake (NPT)		Discharge (NPT)		Shaft			Overall
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

Maintenance Kit for Pump with 25 gpm Max. Flow Rate	0000000	Each	0000000
Maintenance Kit for Pump with 11.5 gpm Max. Flow Rate	0000000	Each	00000

Self-Priming Circulation Pumps without Motor for Water

Also known as flexible impeller pumps, these 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.

For technical drawings and 3-D models, click on a part number.

						Intake (NPT)		Discharge (NPT)		Overall			Shaft
Max. Flow Rate, gpm	Max. ft. of Head	Max. Pressure, psi	Max. Viscosity	Temp. Range, °F	Required hp	Gender	Pipe Size	Gender	Pipe Size	Ht.	Lg.	Wd.	Dia.	Lg.	Ctr.-to-Base Lg.		Each
For 500 rpm-2,100 rpm Motor Speed
13	60	26	Not Rated	50° to 180°	1/3	Female	1/2	Female	1/2	3 13/16"	4 1/2"	4 1/8"	5/8"	1 1/8"	1 15/16"	0000000	0000000
27.9	60	26	Not Rated	50° to 180°	3/4	Female	1	Female	1	3 9/16"	6 3/8"	4 3/4"	5/8"	2 1/4"	1 7/8"	0000000	000000

Maintenance Kit for Pump with 27.9 gpm Max. Flow Rate	0000000	Each	0000000
Maintenance Kit for Pump with 13 gpm Max. Flow Rate	0000000	Each	00000

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
@ 0 psi	@ 3,000 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
86:1 Discharge Liquid to Inlet Air Pressure Ratio
0.19	0.17	28,764	12,470	100	15	145	20	1/4 Female	3/8 Female	1/4 Female	4 5/8"	4"	9"	0000000	000000000
28:1 Discharge Liquid to Inlet Air Pressure Ratio
0.58	0.13	9,365	4,060	100	15	145	20	1/4 Female	3/8 Female	1/4 Female	4 5/8"	4"	9"	0000000	00000000
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	00000000

Harsh-Environment Self-Priming Water-Removal Pumps

This pump has a totally enclosed nonventilated (TENV) motor that is cooled by the liquid being pumped. Also known as a flexible impeller pump, it creates a suction force that can draw liquid upward to fill the pump chamber when your liquid source is below the pump. Mount up to 6 feet above your liquid source. Pump can pass solids up to 1/4" in diameter without clogging, so there’s no need to filter sediment and debris. A handle makes it convenient for on-the-go removal of bilge water, waste oil, and spills. Pump can also be used to cool marine engines and drain liquid from holding tanks.

Note: Pump must be filled with liquid before use. It needs a constant flow of liquid and cannot run dry.

									Overall
Max. Flow Rate, gpm	Max. Ft. of Head, ft.	Max. Solids Dia.	Max. Viscosity, cP	Temp. Range, °F	Horsepower	Current, A	Intake Size	Discharge Size	Ht.	Wd.	Lg.		Each
120V AC, Single Phase—With Thermal Overload Protection
Plug with 8 ft. Cord
5 4/5	30	1/4"	125	60° to 180°	1/4 hp	4.2	1/2 NPT Female, 3/4 GHT Male	1/2 NPT Female, 3/4 GHT Male	9"	5 5/8"	7 3/8"	0000000	0000000

Drill-Operated Water-Removal Pumps

Pump

Pump with Intake and Discharge Tubes

Convenient to keep in your toolkit for on-site cleanup, these pumps attach to your drill for small liquid extraction jobs, as well as draining water from clogged sinks and emptying tanks. Pumps are self-priming, which means they create a suction force to draw liquid upward. Do not use with solids.

Note: Pumps must be filled with liquid before use. They need a constant flow of liquid and cannot run dry.

				Intake			Discharge				Shaft		Overall
Max. Flow Rate, gpm	Max. Feet of Head, ft.	Max. Viscosity, cP	Temp. Range, °F	Hose Size	Thread Type	Gender	Hose Size	Thread Type	Gender	Motor Speed, rpm	Dia.	Lg.	Ht.	Wd.	Lg.	Includes		Each
3 3/4	90	1	40° to 110°	3/4	GHT	Male	3/4	GHT	Male	1,200	1/4"	3/4"	3"	4 1/2"	3"	__	00000000	000000
3 3/4	90	1	40° to 110°	3/4	GHT	Male	3/4	GHT	Male	1,200	1/4"	3/4"	3"	4 1/2"	3"	30" Slip-On Intake Tube, 34" Discharge Tube with 3/4" Male GHT Connection	00000000	00000