---
product_id: 17071690
title: "AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4\" Shaft, Horizontal Engine Fit, PowerBoost (90037)"
brand: "aaa"
price: "€ 350.28"
currency: EUR
in_stock: null
reviews_count: 10
category: "Aaa"
url: https://www.desertcart.ie/products/17071690-aaa-3700-psi-2-5-gpm-replacement-triplex-pressure-washer
store_origin: IE
region: Ireland
---

# 2.5 GPM 3/4" Shaft 3700 PSI AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037)

**Brand:** aaa
**Price:** € 350.28
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Revive Your Pressure Washer: Power Up Your Cleaning Game!

## Quick Answers

- **What is this?** AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) by aaa
- **How much does it cost?** € 350.28 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/17071690-aaa-3700-psi-2-5-gpm-replacement-triplex-pressure-washer)

## Best For

- aaa enthusiasts

## Why This Product

- Trusted aaa brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compatibility is Key:** Fits a wide range of gas pressure washers with horizontal engines.
- • **Oil Level Visibility:** Advanced sight glass technology for easy oil monitoring.
- • **Standard Connections:** Compatible with various pressure washer hoses for seamless use.
- • **PowerBoost Technology:** Experience enhanced cleaning efficiency with adjustable pressure.
- • **Extend Your Power Washer's Life:** Save money and time by replacing just the pump!

## Overview

The AAA 90037 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit is designed for industrial gas-powered machines, delivering a powerful 3700 PSI at 2.5 GPM. This easy-to-install kit includes essential hardware and a siphon tube, ensuring compatibility with many gas pressure washers. With features like PowerBoost Technology for adjustable pressure and advanced oil monitoring, this pump kit is the perfect solution to extend the life of your pressure washer.

## Description

Engineered to surpass expectations, the AAA Triplex Pump Kit (90037) refreshes tired machines and helps you avoid replacing an entire unit. Delivering up to 3700 PSI at 2.5 GPM, this industrial-grade replacement is a smart fit for many gas powered pressure washers that use a horizontal engine and a 3/4" diameter shaft, including popular engines like the Honda GX200 (Check your pressure washer’s inlet and outlet orientation to ensure compatibility). PowerBoost Technology sends higher pressure to the nozzle for a faster clean, while the integrated stainless steel unloader on the pressure washer water pump supports fast starts and dual oversized ball bearings minimize friction and engine load for long-lasting performance. Installation is straightforward thanks to the SAE bolt pattern, garden-hose inlet, and M22 high-pressure outlet, and the kit includes a siphon tube with filter, mounting bolts, shaft key, and instructions. The sight glass and advanced oil seals let you see oil level and quality at a glance (no dipstick needed). You can easily see when oil levels are low or if water has clouded the oil. Thermal relief protection keeps the pump from overheating. Built with robust metal components, the 90037 is a dependable power washer pump replacement for homeowners and pros using SIMPSON pressure washer parts and other common pressure washer pumps. It is great for walls, fences, sidewalks, vehicles, and more. Rely on AAA for a powerful replacement for your Simpson pressure washer pump. Simpson power washers and Simpson power washer parts are built for DIYers and professionals alike to tackle any cleaning job.

Review: Perfect fit and good quality. - Easy replacement and came with everything needed. Even new bolts. Works perfectly and saved me from buying a new pressure washer.
Review: Works great! - Easy to install works great. I got it for my 3600psi DeWalt pressure washer.

## Features

- AAA TRIPLEX REPLACEMENT POWER WASHER PUMP: Replace your SIMPSON pressure washer pump with the AAA Triplex Power Washer Pump to restore cleaning power; It offers up to 3700 PSI at 2.5 GPM and fits horizontal engines with 3/4" shaft such as the Honda GX200
- EASY INSTALLATION: SAE standard bolt pattern fits many gas pressure washers with horizontal engines; To ensure compatibility, be sure to match engine orientation, PSI, GPM, engine shaft diameter, and current pump inlet and outlet connection
- ADJUSTABLE PERFORMANCE: Rely on PowerBoost Technology to increase pressure at the nozzle; Turn the hand knob to match power to tasks from siding and sidewalks to fleet vehicles; Stainless steel integrated unloader supports an easy-start system
- DURABILITY AND EASY MAINTENANCE: Dual oversized ball bearings reduce friction; Thermal relief valve prevents the pump overheating; The sight glass and advanced oil seal technology eliminates the need for a dipstick; Brass manifold adds durability
- POWER WASHER PUMP REPLACEMENT NOTES: This gas powered pressure washer replacement pump features a garden hose inlet and threaded M22 connection for use with pressure washer attachments; Includes siphon tube, hardware, shaft key, and instructions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00TQLMNMC |
| Best Sellers Rank | #29,375 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #17 in Pressure Washer Pumps |
| Brand | AAA |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (502) |
| Global Trade Identification Number | 00879399002076, 08793990020760 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 9 pounds |
| Item model number | 90037 |
| Manufacturer | AAA Pumps |
| Material | Brass |
| Maximum Flow Rate | 2.5 Gallons Per Minute |
| Power Source | Gas Powered |
| Product Dimensions | 12"L x 9"W x 4"H |
| Style | 3700 PSI at 2.5 GPM |
| UPC | 879399002076 |
| Voltage | 120.0 |

## Product Details

- **Brand:** AAA
- **Color:** Black
- **Global Trade Identification Number:** 00879399002076, 08793990020760
- **Item Weight:** 9 Pounds
- **Material:** Brass
- **Maximum Flow Rate:** 2.5 Gallons Per Minute
- **Power Source:** Gas Powered
- **Product Dimensions:** 12"L x 9"W x 4"H
- **Style:** 3700 PSI at 2.5 GPM
- **Voltage:** 120.0

## Images

![AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) - Image 1](https://m.media-amazon.com/images/I/71Dz7TCDcgL.jpg)
![AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) - Image 2](https://m.media-amazon.com/images/I/81mRmUe4IqL.jpg)
![AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) - Image 3](https://m.media-amazon.com/images/I/81xNEzOYxoL.jpg)
![AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) - Image 4](https://m.media-amazon.com/images/I/81MQ2YwMLXL.jpg)
![AAA 3700 PSI 2.5 GPM Replacement Triplex Pressure Washer Pump Kit for SIMPSON Gas Power Washer Pumps, 3/4" Shaft, Horizontal Engine Fit, PowerBoost (90037) - Image 5](https://m.media-amazon.com/images/I/81g1jEUGM1L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit and good quality.
*by P***S on February 17, 2026*

Easy replacement and came with everything needed. Even new bolts. Works perfectly and saved me from buying a new pressure washer.

### ⭐⭐⭐⭐⭐ Works great!
*by C***R on December 14, 2025*

Easy to install works great. I got it for my 3600psi DeWalt pressure washer.

### ⭐⭐⭐⭐⭐ Quilty replacement parts. Works perfectly
*by S***K on September 14, 2025*

Easy to install and works great! Next day delivery was awesome. Thanks

## Frequently Bought Together

- AAA 90037 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 3700 PSI, 2.5 GPM, 3/4" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black
- Valley Industries Pressure Washer Premium Pump Oil - 1 Liter, Black, (PK-85490000)
- STA-BIL Pump Protector - Protects Pressure Washer Pumps and Other Internal Components During Storage, Next Gen Anti-Freeze and Lubricant Formula, 4oz (22007)

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-22*