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Pumps
AAA® Triplex Pump Kit 90037
3700 PSI at 2.5 GPM Industrial Triplex Pump Kit
Online Model No: 90037 (Part No: 90037)
In-Store Model No: 90037 (Part No: 90037)
Engineered to surpass expectations, the 90037 AAA® 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.
*Check your pressure washer’s inlet and outlet orientation to ensure compatibility
Features
Extend the Life of Your Pressure Washer: 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.
Easy Installation: This replacement pump features a garden hose inlet and threaded M22 connection high pressure hose outlet. The SAE standard bolt pattern that fits most* gas-powered pressure washers. 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.
Adjustable Power: 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.
Know When to Change Your Oil: The sight glass and advanced oil seal technology eliminates the need for a dipstick. 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.
Get the Right Pump for Your Machine: This pump is designed for gas powered pressure washers with horizontal engines. Its SAE bolt pattern, hardware, and standard connections make it a great fit for many brands and models of power washers.
Images shown may vary from the actual unit
*Check your pressure washer’s inlet and outlet orientation to ensure compatibility
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Product Specs
- UPC (Online): 879399002076
- Power Type: Gasoline
- PSI: 3700
- GPM: 2.5
- Pump Type: AAA Triplex Pump
- Pump Brand: AAA
- Diameter: 3/4"
- Hose Diameter: 3/4"
- PowerBoost: Yes
- Head: Brass
- Pump: Black Aluminum
- Hose Diameter: 3/4"
- Frame: Sight glass and advanced oil seal technology, does away with the need for a dipstick
- Shaft Diameter: 3/4"
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Warranty
- 5 Year limited AAA pump warranty
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Reviews
NOTAFANEase of use1/5Quality1/5Effectiveness1/5Value1/5WORSTReviewed on April 21st, 2025Age: 18 to 24 |Purchased from: In-store
CRACKED ABOVE THE OUTLET SIDE AND THE SOAP INLET WHILE I WAS USING IT. USED TWICE AND THIS IS WHAT HAPPENS LOL. PUMP IS CHEAPLY MADE AND CUSTOMER SERVICE WAS THE WORST HELP BUT DID LET ME KNOW THAT THEY WILL SELL BACK DATED SERIAL NUMBERS THAT WILL MAKE YOUR WARRANTY COVERAGE SHORTER. THE ONLY WAY TO FIGHT THAT IS WITH A RECEIPT! SEEM LIKE SHADY BUSINESS PRACTICE TO ME BUT YOU BE THE JUDGE. SHOUT OUT TO SARAH AT CUSTOMER SERVICE ;}
Response from SIMPSONThis certainly isn't the experience we strive for & we hope to alert our National Service Manager to your case. He can be contacted at DHattan@fna-group.com. We would like to understand more about field service issues you have described and hope to improve this experience as quickly as possible. Thanks for reviewing and we hope you will be in contact with him soon!
Simpson TeamApril 23rd, 2025
SpraydoneEase of use4/5Quality2/5Effectiveness5/5Value3/5Not great lifeReviewed in Cullman, Alabama on March 8th, 2025Age: 45 to 54 |Purchased from: In-storeDied on my Simpson presser washer after two years. Now I have to buy a new one 1/3 of the price of entire unit🤦
Response from SIMPSONWe're sorry to hear about the unexpected failure, Spraydone. This certainly isn't what we stive for & we appreciate this valuable feedback. Please don't hesitate to contact our team at 877-362-4271 or email us at productsupport@simpsoncleaning.com if we can assist you in getting the replacement you need to get back up and running as soon as possible! Thanks for taking the time to share your experience!
Simpson TeamMarch 10th, 2025
David JCheaply built... horrible customer serviceReviewed on December 22nd, 2023Had this not even a year and the manifold developed leaks...the receipt from Lowe's was so faded you couldn't make it out so Simpson would not honor the warranty. Within a month the hose busted,but they did send me another one...they made that right but not the manifold.,crazy stuff,.I'll never by anything with the Simpson name on it again
pj pabloEase of use5/5Quality4/5Effectiveness5/5Value4/5Needs Better Design at Hose ConnectReviewed in Mobile, AL on September 13th, 2023Age: 45 to 54 |Purchased from: In-storeI've had my Simpson 3700 PSI pro series pressure washer for about 6 months. I use it frequently and yesterday the plastic hose connection came off separated from the brass fitting I don't know if I can replace it or if I have to buy a whole new pump but it just came off in my hand so they should put a brass fitting on that connection so that plastic doesn't come off like it did on mine... Save somebody down the road some money... But other than that she's been a beast.
Response from SIMPSONHi, pj pablo. We're glad to hear your 3700 PSI pressure washer has performed with impressive power, and we're sorry to hear about the broken connection. At your earliest convenience, would you reach out to our support team at 877-362-4271 or email us at productsupport@simpsoncleaning.com? We hope to figure out just what is needed to get you up and running flawlessly as quickly as possible. Thank you for sharing your experience, and we hope to be hearing from you soon!
Simpson TeamSeptember 15th, 2023
Denny PEase of use5/5Quality1/5Effectiveness1/5Value1/5Worked for 3 minutesReviewed in SW Michigan on August 29th, 2023Age: 65 or over |Purchased from: OnlineBought on Amazon. Took my time installing. Cleaned keyway, antisieze, Liked the mounting hardware and inc key stock. Hooked up and turned on water, started, took approx 30 seconds to make pressure. Cleaned for about 3 min and no pressure. Emailed last Friday and still no response Monday.
Response from SIMPSONHi, Denny P. We're sorry to hear about this disappointing performance. This is not at all what expect to hear. Would you reach out to our team directly by calling 877-362-4271. We would like explore solutions and hope to improve your experience as soon as possible. Thank you for your feedback and we hope you will be in touch!
Simpson TeamAugust 29th, 2023
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