---
product_id: 23326016
title: "AAA 90039 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1\" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines"
brand: "aaa"
price: "€ 614.69"
currency: EUR
in_stock: true
reviews_count: 9
category: "Aaa"
url: https://www.desertcart.pt/products/23326016-aaa-90039-horizontal-triplex-plunger-replacement-pressure-washer-pump-kit
store_origin: PT
region: Portugal
---

# 3.5 GPM flow rate 1" shaft with SAE bolt pattern 4000 PSI max pressure AAA 90039 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines

**Brand:** aaa
**Price:** € 614.69
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your power wash game—clean smarter, not harder!

## Quick Answers

- **What is this?** AAA 90039 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines by aaa
- **How much does it cost?** € 614.69 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/23326016-aaa-90039-horizontal-triplex-plunger-replacement-pressure-washer-pump-kit)

## 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

- • **Universal SAE Compatibility:** Fits a wide range of gas pressure washers with horizontal engines, including Honda GX270, for seamless upgrades.
- • **Quick Connect & Garden Hose Ready:** Compatible with popular Simpson hoses for fast setup and versatile cleaning applications.
- • **Durable Dual Oversized Ball Bearings:** Engineered to reduce friction and extend pump life even under the toughest industrial conditions.
- • **Easy Oil Monitoring with Sight Glass:** No more guesswork—see oil levels and quality instantly to keep your pump running smoothly.
- • **PowerBoost Technology for Adjustable Pressure:** Customize your cleaning power with a simple hand-turn knob—high pressure when you need it, gentle when you don’t.

## Overview

The AAA 90039 Horizontal Triplex Plunger Replacement Pump Kit delivers industrial-grade 4000 PSI pressure and 3.5 GPM flow for efficient, customizable cleaning. Designed for gas-powered washers with a 1" shaft and SAE bolt pattern, it features PowerBoost Technology, easy oil level monitoring via sight glass, and durable dual ball bearings for long-lasting performance. Compatible with popular hoses and built for easy installation, this pump kit extends your machine’s life while maximizing cleaning power.

## Description

Engineered to surpass expectations, the 90039 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 1" diameter shaft, such as the Honda GX270. This pump can produce up to 4000 PSI at 3.5 GPM. The 90039 is designed with dual oversized ball bearings to reduce friction and allow for long lasting performance in the toughest cleaning environments. The 90039 features a stainless steel integrated unloader featuring our easy-start system. (*Check your pressure washer's inlet and outlet orientation to ensure compatibility)

Review: Muy útil y le funcionó a la máquina de presión 💯
Review: Worked great - Installed on old pressure washer works great.

## 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 4000 PSI at 3.5 GPM to wash walls, sidewalks, vehicles, and more
- Compatibility: 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 power: 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
- Standard Connections: This replacement pump features a garden hose inlet and quick connect high pressure hose outlet; Use it with many pressure washer hoses, including Simpson Armor 41114, 41096, 41115 or Simpson Monster 41113, 41028, 41030, 41032, 41034

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00TQLMPM0 |
| Best Sellers Rank | #121,920 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #55 in Pressure Washer Pumps |
| Brand | AAA |
| Color | Metallic |
| Customer Reviews | 4.1 4.1 out of 5 stars (230) |
| Global Trade Identification Number | 00879399002090 |
| Item Weight | 14 pounds |
| Item model number | 90039 |
| Manufacturer | Simpson |
| Material | Brass |
| Maximum Flow Rate | 3.5 Gallons Per Minute |
| Power Source | Gas Powered |
| Product Dimensions | 11"L x 11"W x 7.5"H |
| Style | 4000 PSI at 3.5 GPM |
| UPC | 879399002090 |

## Product Details

- **Brand:** AAA
- **Color:** Metallic
- **Global Trade Identification Number:** 00879399002090
- **Item Weight:** 14 Pounds
- **Manufacturer:** Simpson
- **Material:** Brass
- **Maximum Flow Rate:** 3.5 Gallons Per Minute
- **Power Source:** Gas Powered
- **Product Dimensions:** 11"L x 11"W x 7.5"H
- **Style:** 4000 PSI at 3.5 GPM

## Images

![AAA 90039 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines - Image 1](https://m.media-amazon.com/images/I/71UfvYTtB6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***L on January 6, 2026*

Muy útil y le funcionó a la máquina de presión 💯

### ⭐⭐⭐⭐⭐ Worked great
*by V***N on July 18, 2025*

Installed on old pressure washer works great.

### ⭐ Do not buy lasted only a few washes
*by J***C on September 1, 2025*

This is the exact same factory replacement for my wall pressure washer. The first one last to be 4 1/2 years using it a few times a week to clean off our cars and atvs. I decided to go with the exact same brand and model hoping I can get another 4 to 5 years. I’ve had this for one year now, and I installed the three months after receiving it. And only use a pressure washer a total of five times. To wash my vehicles so in reality it’s only been on for a few months. I know everyone’s gonna ask. Yes I put the correct type of oil. Yes, I’ve put the right amount of oil but the issue I have is the seals internally started leaking even used with cold water. It’s never been run dry. And now I need to buy another head because there’s water in the oil and the head’s making a loud noise again I do not recommend buying these on Amazon. I guarantee you there’s some defective ones or maybe they’re just fake clones. We’re not even getting a few months out of a pressure washer and I spent couple hundred dollars crap stay away from this. I will upload the pictures to show where the water is leaking through it which is just crazy.

## Frequently Bought Together

- AAA 90039 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines
- Valley Industries Pressure Washer Premium Pump Oil - 1 Liter, Black, (PK-85490000)
- Northstar Pressure Washer Pressure Gauge - 5000 PSI, 3/8in. Fitting

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-31*