Pressure Washing Pumps | McMaster-Carr

	Maximum Pressure Maximum Pressure

Less than 1,000 psi

1,000 to 2,999 psi

3,000 psi or greater

	For Use With For Use With

	Power Source Power Source

Add-a-Motor

Air

Electric

	Maximum Feet of Head Maximum Feet of Head

	Maximum Flow Rate Maximum Flow Rate

	Required Horsepower Required Horsepower

	For Motor Power Source For Motor Power Source

Electric

Air

	Shaft Diameter Shaft Diameter

5/8"

	Pump Type Pump Type

Positive Displacement

Plunger

Piston

Centrifugal

	Housing Material Housing Material

Brass

Iron

Stainless Steel

	Intake Pipe Size Intake Pipe Size

	Overall Length Overall Length

	Overall Width Overall Width

	Overall Height Overall Height

	Discharge Pipe Size Discharge Pipe Size

	Intake Location Intake Location

Side

Bottom

Front

	For Maximum Motor Speed For Maximum Motor Speed

600 rpm

1,725 rpm

1,800 rpm

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Shaft Center-to-Base Length Shaft Center-to-Base Length

3 1/2"

4 1/8"

4 1/2"

	Shaft Length Shaft Length

1 1/4"

1 5/8"

2 5/8"

	Minimum Temperature Minimum Temperature

0° F

35° F

	Discharge Location Discharge Location

Side

Top

	Pump Style Pump Style

Constant Flow Rate

Circulating

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About Process Pumps

Also known as plunger pumps, these can provide pressures up to 3,600 psi. Use them for washdowns, drain jetting, and other pressurized water-spraying applications. Connect an electric motor with a speed reducer or belt pulley to alter the pump speed. Pumps are gravity fed and require an elevated liquid source to fully fill the pump before turning on. Do not run dry or use with solids.

						Intake			Discharge			Overall
Max. Flow Rate, gpm	Max. Ft. of Head, ft.	Max. Pressure, psi	Max. Viscosity	Temp. Range, °F	Required hp	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Lg.	Wd.	Ht.		Each
2.1	4,620	2,000	Not Rated	35° to 160°	2.9	1/2	NPT	Female	3/8	NPT	Female	9 3/16"	6 3/16"	5 11/16"	00000000	0000000
4	6,930	3,000	Not Rated	35° to 160°	7 2/5	1/2	NPT	Female	3/8	NPT	Female	9 3/16"	7 1/2"	6 11/16"	00000000	000000
4.3	8,316	3,600	Not Rated	35° to 160°	9 1/2	3/4	NPT	Female	1/2	NPT	Female	12 1/8"	10"	7 1/4"	00000000	00000000
4.8	5,775	2,500	Not Rated	35° to 160°	7 3/5	1/2	NPT	Female	3/8	NPT	Female	9 3/16"	7 1/2"	6 11/16"	00000000	000000
5.8	8,316	3,600	Not Rated	35° to 160°	12 4/5	3/4	NPT	Female	1/2	NPT	Female	12 1/8"	10"	7 1/4"	00000000	00000000

Constant-Flow-Rate Pumps without Motor for Pressure Washing

Also known as piston pumps, these are often used for washdowns, drain jetting, and in other pressurized water-spraying applications. They can provide pressures up to 800 psi. Connect an electric motor with a speed reducer or belt pulley to alter the pump speed. Pumps are gravity fed and require an elevated liquid source to fully fill the pump before turning on. Do not run dry or use with solids.

					Intake			Discharge			Overall			Shaft
Max. Flow Rate, gpm	Max. Ft. of Head, ft.	Max. Pressure, psi	Max. Viscosity	Required hp	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Lg.	Wd.	Ht.	Dia.	Lg.	Center-to-Base Lg.		Each
2.9	1,848	800	Not Rated	1.7	1/2	NPT	Female	1/2	NPT	Female	5 5/8"	5 1/8"	6 3/8"	5/8"	1 1/4"	3 1/2"	0000000	0000000
3	1,155	500	Not Rated	1 1/5	1/2	NPT	Female	1/2	NPT	Female	5 5/8"	5 1/8"	6 3/8"	5/8"	1 1/4"	3 1/2"	0000000	000000
10	924	400	Not Rated	3	3/4	NPT	Female	3/4	NPT	Female	8 1/8"	6 3/4"	7 11/16"	1"	1 5/8"	4 1/8"	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
@ 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

High-Head Circulation Pumps for Water

Also known as booster pumps, these have a multistage impeller that propels water about two times higher and farther than standard circulation pumps. Use them in applications such as water delivery, irrigation, and pressure washing. The motor is totally enclosed fan-cooled (TEFC) for use in dusty, dirty, and damp environments. Pumps are gravity fed and require an elevated liquid source to fully fill the pump before turning on. Do not run dry or use with solids.

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

Note: 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.

	Flow Rate, gpm														Intake (NPT)		Discharge (NPT)		Overall
Max. Flow Rate, gpm	@ 60 ft. of Head	@ 70 ft. of Head	@ 80 ft. of Head	@ 90 ft. of Head	@ 100 ft. of Head	@ 110 ft. of Head	@ 120 ft. of Head	@ 130 ft. of Head	@ 140 ft. of Head	Max. ft. of Head	Max. Pressure, psi	Max. Viscosity, cP	hp	Current, A	Pipe Size	Gender	Pipe Size	Gender	Lg.	Wd.	Ht.		Each
120/240V AC, Single Phase
Hardwire
22	__	__	21	20	18	17	15	13	10	163	232	50	1	10.6/5.4	1	Female	1	Female	14 3/8"	6 1/4"	8 1/4"	0000000	000000000
22	21	19	17	14	12	8	__	__	__	121	232	50	3/4	7.6/3.9	1	Female	1	Female	12"	6 1/4"	8 1/4"	0000000	00000000