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CAT 3CP1221 Solid Shaft Stainless Steel Pressure Washer Pump

SKU: 3CP1221


This 4.2 GPM 2000 PSI triplex positive displacement, reciprocating, plunger pump is constructed of a 316 SS Mainfolds & 316 SS valve assemblies.

This is a triplex [three plunger rods] positive displacement, reciprocating, plunger pump, constructed of a 316 SS Mainfolds, 316 SS valve assemblies, solid ceramic plungers and standard NBR [Buna-N] seals and o-rings.


  • Maximum Volume: 4.2 GPM

  • Maximum Discharge Pressure: 2000 PSI

  • Maximum Inlet Pressure: 100 PSI

  • Maximum Pump Speed: 1725 RPM

  • Standard Liquid Temperature: 160 F (Above 130 F call CAT PUMPS for inlet conditions and elastomer recommendations)
  • Bore Diameter: 18 mm

  • Stroke: 12.7 mm

  • Shaft Diameter: 16.5 mm

  • Solid Shaft

  • Inlet Ports: 2 x 1/2″ NPTF

  • Discharge Ports: 2 x 3/8″ NPTF

  • Pulley Mounting: Either Side

  • Crankcase Capacity: 10 oz.

  • Approximate Weight: 15 lbs.

Please Note: Pump Rails show on image are not included with pump.

Weight 16 lbs
Shaft Diameter

Max Volume

Max Discharge Pressure

Max Pump Speed

Max Inlet Pressure

Bore Diameter


Max Fluid Temp.

Inlet Port

Discharge Port

Standard Temperature




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