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CAT Pumps 3300 PSI 2.5 GPM (3/4" Shaft) Triplex Pressure Washer Pump w/ Adjustable Unloader
Model:
4PPX25GSI
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Features
Grade
Professional
Style
Gas
Inflow
3/8" Threaded (Female)
Outflow
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; 140°F 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
- 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 The Shaft & Flange Bolt Holes Accurately!
- There is a 25% restock fee for returned pumps
- See the Owner's Manual (under the Specs tab) for dimensions
- Pump ships bare so you'll need to re-use your connectors & siphon tube or purchase them separately
- Please Call Us For Sizing Assistance w/ Information Below:
- 1. Age of Pump and Model # (must be no more than 15-yrs old)
- 2. Is the pump Vertical or Horizontal
- 3. Shaft Size - 3/4", 7/8" (vertical ONLY), 1", or Belt Drive XXmm
- 4. Engine Brand and HP (model # if available would be helpful)
- ***Shaft Size Measurements Must Be Precise***
Specifications
4PPX25GSI

General Information
Product Category
Pressure Washer Pumps
Overview
Product Category
Pressure Washer Pumps
Weight
10.7 Pounds
Consumer Warranty
2 Years
Product Length
8.03 Inches
Product Width
7.83 Inches
Product Height
6.61 Inches
Accessories
Pump Brand
CAT
Pump Type
Triplex Plunger
Shaft Size
3/4
Pump Design
Horizontal
Adjustable Pressure
Yes
Accessory Grade
Professional
Accessory Style
Gas
Inflow
3/8" Threaded (Female)
Outflow
3/8" Threaded (Male)
Maximum GPM
Maximum GPM
Gallon per Minute
2.5
Rated PSI
3300 PSI
Chemical Injections
Sold Separately
Reviews
(5)
Cat Pumps 4PPX25GSI Reviews & Ratings

Not As Advertised
By Amr M.
Grove city, Ohio
Purchased 09/14/2021 |
Review Posted 10/08/2021
Pump sent was used and the wrong model number even when adjusted it never hit rated psi
Amr M. Recommends This
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Expert Response
First and foremost thank you for your purchase of the CAT Pumps 3300 PSI 2.5 GPM Triplex Pressure Washer Pump w/ Adjustable Unloader. We appreciate you taking the time to provide us with your feedback and we can certainly understand your aggravation.
We apologize for any issue you may be having and would like to help rectify the situation. If you could please send some images of the pump and describe the issue to service@pressurewashersdirect.com, we will be able to review and confirm the pump for you.
We appreciate your business and apologize for any inconvenience.
We apologize for any issue you may be having and would like to help rectify the situation. If you could please send some images of the pump and describe the issue to service@pressurewashersdirect.com, we will be able to review and confirm the pump for you.
We appreciate your business and apologize for any inconvenience.

Dale V.
Power Equipment Expert
Rating Breakdown
3/5
1/5
1/5
1/5

Exact Replacement For My 10 Year Old Cat Pump
By Highmark L.
Conestoga, Pennsylvania
Purchased 04/14/2021 |
Review Posted 05/13/2021
Simple install, works like expected. New life for my 10 yr old machine.
Highmark L. Recommends This
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Rating Breakdown
4/5
4/5
4/5
4/5

Does Not Have The Pressure Output Specified Could Could Not Pinp
By Chau N.
Splendora, Texas
Purchased 07/18/2020 |
Review Posted 08/20/2020
Installed went well but pressure output was very weak.
Chau N. Recommends This
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Rating Breakdown
5/5
5/5
2/5
5/5
Pros:
Features

Good Pump
By John G.
Cumming, Georgia
Purchased 02/03/2020 |
Review Posted 02/28/2020
Replaced a CAT 3DX that failed. This pump has similar specs and is working great.
John G. Recommends This
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Rating Breakdown
4/5
4/5
4/5
4/5
Pros:
Quiet, Reliable, High Quality, Id Buy It Again

Very Smooth Working Pressure.
By Matt S.
Stanford, Kentucky
Purchased 02/23/2018 |
Review Posted 03/20/2018
Good pump, had to remount engine to get it to fit on the cart.
Doesn’t seem to put out quite as much pressure as the previous 3300 psi AAA pump that was on it. But it’s got a smoother pressure through the wand. Smooth transitions on the unloader. Well worth the money.
Doesn’t seem to put out quite as much pressure as the previous 3300 psi AAA pump that was on it. But it’s got a smoother pressure through the wand. Smooth transitions on the unloader. Well worth the money.
Matt S. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Durable, Price, Reliable, High Quality
Cons:
Bad Instructions
Product Q&A
(2)

Product Questions
Answered by Jim, the Pressure Washer Expert
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.
Wayne
from Virginia
January 06, 2016
can the 4PPX25GSI pump fit the northstar gsx 160 pressure washer
Nelson
from California
August 06, 2015
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Manuals
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CAT Pumps 3300 PSI 2.5 GPM (3/4" Shaft) Triplex Pressure Washer Pump w/ Adjustable Unloader




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