SIMPSON Aaa 3700 Psi At 2.5-GPM Industrial Triplex Plunger Pump Kit

Name: SIMPSON Aaa 3700 Psi At 2.5-GPM Industrial Triplex Plunger Pump Kit
Brand: SIMPSON
SKU: 1002573268
Price: 259.99 USD
Availability: InStock
Rating: 4.6 (23 reviews)

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4.6

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SIMPSONAaa 3700 Psi At 2.5-GPM Industrial Triplex Plunger Pump Kit

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Engineered to surpass expectations, the 90037 AAA® professional triplex pump is highly efficient and minimizes engine load while delivering top performance. This easy-to-install pump replacement kit is for gas pressure washers with a horizontal engine and a 3/4" diameter shaft, such as the Honda GX200. This pump can produce up to 3700 PSI at 2.5 GPM. The 90037 is designed with dual oversized ball bearings to reduce friction and allow for long lasting performance in the toughest cleaning environments. The 90037 features a stainless steel integrated unloader featuring our easy-start system.

Save money by replacing your pump instead of buying a whole new power washer, this easy-to-install kit is great for power washers that can support 3700 PSI at 2.5 GPM to wash walls, fences, sidewalks, vehicles, and more
This replacement pump features a garden hose inlet and threaded M22 connection high pressure hose outlet
Each kit includes a siphon tube with filter, mounting bolts, shaft key, and instruction booklet to get your machine back in action as quickly as possible
This pump includes PowerBoost® Technology that delivers higher pressure at the nozzle for a more efficient cleaning experience, there is also a hand-turn knob that lets you reduce power at your convenience for tasks that require lower pressure
The sight glass and advanced oil seal technology eliminates the need for a dip stick, with visibility to the oil level and the oil itself, you can easily see when oil levels are low or if water has clouded the oil.
This pump is designed for gas powered pressure washers with horizontal engines
Its bolt pattern, hardware, and standard connections make it a great fit for many brands and models of power washers
90 Day Limited Accessory Warranty

General
Type	Pressure washer pump	Package Contents	Triplex Pump, Mounting Bolts, Siphon Tube

Dimensions
Height (Inches)	4	Width (Inches)	12
Length (Inches)	9

Features
Shut Off PSI (PSI)	3700	Water Flow (GPM)	2.5

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -

Warranty
Warranty	5-year commercial

Labor
Installation Time (Minutes)	15

Miscellaneous
UNSPSC	47121900

Check out the Best Selling Pressure Washer Pumps & Pump Kits on Lowes.com

Review

4.6 out of 5

23 Reviews

3 Star

94% Recommend this product

Ratings may include incentivized customer reviews.

23 Customer Reviews

Sort By

Would Recommend

I purchased this offset smoker and it has exceeded my expectations. The process of purchasing it online was easy and was a great value, the delivery went flawlessly.

Bob27September 23, 2026
From Aaa 3200 Psi At 2.8-GPM Industrial Triplex Plunger Pump Kit Verified Purchaser

Was this Review Helpful ?

Easy installation

Would Recommend

Easy installation

Bob27September 14, 2026
From Aaa 4000 Psi At 3.5-GPM Industrial Triplex Plunger Pump Kit Verified Purchaser

Was this Review Helpful ?

Response from SIMPSON Team

We're happy to hear your pump kit paired right up with your existing unit, Bob27!

SIMPSON TeamOctober 1, 2026

simpson

Excellent replacement pump

Still going after 10 years of service. Replaced the cheap pump that came on my Karcher pressure washer that lasted 2 years, Briggs Intek motor is great. This pump transformed my pressure washer into a powerhouse that has exceeded my expectations in every way. Only issue was the hose and wand had to be replaced as well due to the near doubling of pressure.

GregthtekJune 10, 2026

From simpsoncleaning.com

Fits 3/4” drive shaft

Would Recommend

Came as described, already filled with oil. Very easy install.

CondenApril 26, 2026
Verified Purchaser

Was this Review Helpful ?

Response from SIMPSON Team

It's great to hear your pump kit paired right up with your pressure washer & it has performed to meet your expectations. Thanks for reviewing... Read More

SIMPSON TeamApril 27, 2026

simpson

Good replacement of OEM pump

Would Recommend

Easy to install. Works great.

Cbl mnApril 1, 2026
Verified Purchaser

Was this Review Helpful ?

Response from SIMPSON Team

It's great to hear your pump kit paired right up with your existing pressure washer & it has delivered a flawless performance. Thanks for rev... Read More

SIMPSON TeamApril 1, 2026

simpson

Powerful unit when it works

Pressure dropped and noticed water spraying out around the soap outlet area. Further inspection revealed this crack. Worst part is I can’t find the proof of purchase receipt and this is the second time that using it.

Derrick DFebruary 21, 2026

From simpsoncleaning.com

Response from Simpson Team

Thanks for sharing your experience, Derrick D. If you would reach out to our team directly at 877-362-4271 or email us at productsupport@simpsoncleani... Read More

Simpson TeamFebruary 23, 2026

Can't go wrong purchasing this.

Would Recommend

Easy to install. And agreak product.

PapabobFebruary 14, 2026
Verified Purchaser

Was this Review Helpful ?

Response from SIMPSON Team

We're happy to hear installation was a breeze & your pump kit has delivered a great performance. Thanks for the positive feedback, Papabob! ... Read More

SIMPSON TeamFebruary 16, 2026

simpson

Not great life

Would Not Recommend

Died on my Simpson presser washer after two years. Now I have to buy a new one 1/3 of the price of entire unit🤦

SpraydoneMarch 8, 2025

From simpsoncleaning.com

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86c2ltcHNvbg/157a9cde-e2f9-5e57-9a3f-ce8f421bfaab

Response from Simpson Team

We're sorry to hear about the unexpected failure, Spraydone. This certainly isn't what we stive for & we appreciate this valuable feedback. Please don... Read More

Simpson TeamMarch 10, 2025

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		Name	Current Item SIMPSONAaa 3700 Psi At 2.5-GPM Industrial Triplex Plunger Pump Kit
		Price	^$ 259 ^.99
		Ratings	23
		Width (Inches)	12
		CA Residents: Prop 65 Warning(s)
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^$ 244 ^.40	^$ 450 ^.99 $644.99	^$ 264 ^.99 $378.99	^$ 284 ^.26 $499.67	^$ 519 ^.95	^$ 273 ^.77
					1
23	25	21.65	10.94	12.9	6.5