---
product_id: 31524716
title: "AAA 4400 PSI 4.0 GPM Horizontal Replacement Pressure Washer Pump Kit, 90034 | Industrial Grade Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 1\" Shaft, Includes Hardware & Siphon Tube"
brand: "simpson"
price: "121812F"
currency: XPF
in_stock: true
category: "Simpson"
url: https://frenchpolynesia.desertcart.com/products/31524716-aaa-4400-psi-4-0-gpm-horizontal-replacement-pressure-washer
store_origin: PF
region: French Polynesia
---

# 4.0 GPM flow rate SAE standard bolt pattern 4400 PSI max pressure AAA 4400 PSI 4.0 GPM Horizontal Replacement Pressure Washer Pump Kit, 90034 | Industrial Grade Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 1" Shaft, Includes Hardware & Siphon Tube

**Brand:** simpson
**Price:** 121812F
**Availability:** ✅ In Stock

## Summary

> 🚿 Upgrade your clean game—power, precision, and longevity in one pump!

## Quick Answers

- **What is this?** AAA 4400 PSI 4.0 GPM Horizontal Replacement Pressure Washer Pump Kit, 90034 | Industrial Grade Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 1" Shaft, Includes Hardware & Siphon Tube by simpson
- **How much does it cost?** 121812F with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [frenchpolynesia.desertcart.com](https://frenchpolynesia.desertcart.com/products/31524716-aaa-4400-psi-4-0-gpm-horizontal-replacement-pressure-washer)

## Best For

- simpson enthusiasts

## Why This Product

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

## Key Features

- • **Durable Industrial-Grade Build:** Dual oversized ball bearings and brass components ensure long-lasting, friction-free performance.
- • **Quick Connect Hose Compatibility:** Seamlessly integrates with popular pressure washer hoses for fast setup and maximum convenience.
- • **Oil Sight Glass for Smart Maintenance:** Monitor oil levels at a glance—no dipstick, no downtime, just smooth operation.
- • **Easy Compatibility with Horizontal Engines:** Fits most gas pressure washers with a 1" shaft and SAE bolt pattern—no guesswork needed.
- • **PowerBoost Technology for Peak Performance:** Experience turbocharged cleaning power with adjustable pressure to tackle any job.

## Overview

The AAA 4400 PSI 4.0 GPM Horizontal Replacement Pressure Washer Pump Kit (model 90034) is a robust, easy-to-install upgrade designed for gas-powered washers with horizontal engines. Featuring PowerBoost Technology, a 1" shaft, and SAE standard bolt pattern, it delivers industrial-grade cleaning power with smart oil monitoring and durable construction, backed by a 5-year warranty.

## Description

Engineered to surpass expectations, the 90034 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 GX390. This pump can produce up to 4400 PSI at 4.0 GPM. The 90034 is designed with dual oversized ball bearings to reduce friction and allow for long lasting performance in the toughest cleaning environments. The 90034 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 4400 PSI at 4.0 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 | B01D4X0CCK |
| Best Sellers Rank | #90,987 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #41 in Pressure Washer Pumps #1,047 in Pressure Washer Accessories |
| Brand Name | SIMPSON |
| Color | Black |
| Customer Reviews | 3.8 3.8 out of 5 stars (278) |
| Flow Rate | 4 gpm |
| Global Trade Identification Number | 00879399002335 |
| Included Components | Pump Kit |
| Item Dimensions L x W x H | 11.5"L x 11.5"W x 11"H |
| Item Highlight | Industrial Grade Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 1" Shaft, Includes Hardware & Siphon Tube |
| Item Type Name | Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines |
| Item Weight | 16 pounds |
| Manufacturer | simpson |
| Manufacturer Part Number | 90034 |
| Manufacturer Warranty Description | 5 year warranty |
| Material Type | Brass, Black Aluminum |
| Model Number | 90034 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Gasoline |
| Product Style | PowerBoost Technology |
| Specific Uses For Product | Replacement Part, pressure washing |
| UPC | 879399002335 |
| Unit Count | 1 Count |
| Voltage | 120 |

## Product Details

- **Brand:** SIMPSON
- **Color:** Black
- **Global Trade Identification Number:** 00879399002335
- **Item Weight:** 16 pounds
- **Material:** Brass, Black Aluminum
- **Maximum Flow Rate:** 4 gpm
- **Power Source:** Gasoline
- **Product Dimensions:** 11.5"L x 11.5"W x 11"H
- **Style:** PowerBoost Technology
- **Voltage:** 120

## Images

![AAA 4400 PSI 4.0 GPM Horizontal Replacement Pressure Washer Pump Kit, 90034 | Industrial Grade Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 1" Shaft, Includes Hardware & Siphon Tube - Image 1](https://m.media-amazon.com/images/I/71UfvYTtB6L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Que medida es el eje o el chaf**
A: 1 inch

**Q: I have a 13 hp Honda with 4000 psi 3.8gpm cat pump...will this pump mount with same bolt pattern?**
A: ABSOLUTELY, no problem. Perfect fit for the GX390, WELL WITHIN SPECS! Better pump choice is the AR RKV45G40HD-F24 4000psi @ 4.5 gpm OR Bertolini WMG 4043 4000psi @ 4.3 gpm ......both superior to the "tipple A" ....Although the "cat" is better quality than all the above in the 4000 @ 4.0 gpm, but pricey! Keep in mind, that when a "pressure washer manufacture" like DeWalt publish a given pressure, it's typically 8% above the actual pressure EVER achievable. The reason for this is a deceiving sales tactic that manufactures like DeWalt take advantage of. The ASTM guidelines on pressure washers allow for a 8%  in min/max operating pressures so the pressure washer manufacture (not the pump mfg) takes the MAX pressure the actual pump is capable of producing and multiply by .08 and round down to the next "whole number". The cat pump on you're machine is only capable in the neighborhood of 3800 psi. ANY of the above listed pumps will exceed the performance of your OEM equipment from De Fault!

**Q: Will this pull water from a tank?**
A: i use a water tank it' in a truck so it's higher than the pump gravity feed

**Q: Will this fit dxpw4035 dewalt pressure washer?**
A: Technically it would fit on the Honda Engine but this pump required a 13HO GX390 Engine and the DXPW4035 has a GX270 9HP engine.

The suggested replacement pump is the 90038 AAA Pump

Thank You

Allparts Equipment Technical Service Team

## Frequently Bought Together

- AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black
- 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 French Polynesia*
*Store origin: PF*
*Last updated: 2026-09-11*