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CAT Pumps 3300 PSI 2.5 GPM Replacement Triplex Plunger Pressure Washer Pump w/ Adjustable Unloader

Cat Pumps Pressure Washers and Accessories
Model: 4PPX25GSI
(Based on expert analysis, manufacturer ratings and customer reviews)
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3/8" Threaded (Female)
3/8" Threaded (Male)
CAT Brand Triplex Plunger Replacement Pump
Durable & long lasting; advanced design for smooth liquid flow
3/8" NPT female inlet, 3/8" NPT male outlet; 140F maximum water temperature

Concentric Solid Ceramic Plungers
Ceramic runs cooler, lasts longer; assures true wear surface
Specially formulated seals deliver extended seal life

Stacked Valve Design
Makes servicing easy
0.268 stroke; 0.551 bore; requires 8.5 oz. pump oil

Ultra-Compact 3/4" Hollow-Shafted Pump
Designed for direct mounting to gas engine

Integral Pressure Unloader
Standard built-in bypass controls pressure & protects the pump

1/4" Fixed Chemical Injector Hose Barb
Allows addition of pressure washer safe soap to the water flow

Be Sure To Measure Shaft & Flange Bolt Holes Accurately!
There is a 25% restock fee on returned pumps
See the Owner's Manual for dimensions
This is a bare pump; you will need to re-use your current fittings or purchase new ones (sold separately)

3/8" Threaded (Female)
3/8" Threaded (Male)
Rated PSI
3300 PSI
10.7 Pounds
Product Length
8.03 Inches
Product Width
7.83 Inches
Product Height
6.61 Inches
Consumer Warranty
2 Years
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*Ask Brian about the Cat Pumps 4PPX25GSI. Sorry, no repair questions:




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  2 Questions
Q: I have a 6hp, 3450rpm, 3/4 shaft motor. will this motor work with this pump rated at 3400rpm. Or can you recommend a single phase motor for this pump. Thanks.
by Wayne from Virginia on January 06, 2016

A: Thanks for your inquiry. Yes, this pump will work on your engine. However, this is a bare pump without the inlet and outlet fittings. It also does not include the thermal relief valve. I would recommend purchasing the fully plumed pump model SLP4PPX30GSI-057. I have attached a link for you to view the same pump just fully plumed and ready to go.

Fully Plumed Pump
by Brian, Product Expert
Q: can the 4PPX25GSI pump fit the northstar gsx 160 pressure washer
by Nelson from California on August 06, 2015

A: No, a Honda GX 160 does not have enough power to drive this pump. With your unit, I would recommend the General Pump model SLPTP2530-401. I have attached a link for you to view that item.

General Pump
by Brian, Product Expert
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