---
product_id: 653578629
title: "Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240)"
brand: "simpson"
price: "$5037"
currency: NZD
in_stock: false
url: https://www.desertcart.nz/products/653578629-simpson-cleaning-4200-psi-gas-pressure-washer-4-0-gpm
store_origin: NZ
region: New Zealand
---

# 4.0 GPM water flow 50-ft steel-braided hose 4200 PSI peak pressure Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240)

**Brand:** simpson
**Price:** $5037
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Power through grime like a pro with Simpson’s unstoppable 4200 PSI beast!

## Quick Answers

- **What is this?** Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) by simpson
- **How much does it cost?** $5037 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/653578629-simpson-cleaning-4200-psi-gas-pressure-washer-4-0-gpm)

## 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

- • **Built to Last & Roam:** Aircraft-grade aluminum frame with 13-inch pneumatic tires ensures rugged durability and smooth mobility on any terrain.
- • **All-Inclusive Pro Kit:** Includes 50-foot kink-resistant steel-braided hose, 5 versatile nozzles, detergent siphon, and steel wand for every cleaning challenge.
- • **Plug & Play Efficiency:** Quick-connect nozzles and ergonomic spray gun make setup and nozzle swaps effortless—get to work faster.
- • **Unmatched Commercial Power:** Honda GX390 engine + CAT triplex pump deliver beastly 4200 PSI and 4.0 GPM for pro-grade cleaning.
- • **Warranty-Backed Reliability:** 10-year frame, 5-year pump, and 3-year engine warranties protect your investment and peace of mind.

## Overview

The Simpson ALH4240 is a commercial-grade gas pressure washer featuring a robust Honda GX390 engine paired with a maintenance-free CAT triplex plunger pump, delivering 4200 PSI at 4.0 GPM. Its ultra-durable aircraft-grade aluminum frame and 50-foot steel-braided hose provide unmatched portability and longevity. Designed for contractors and serious DIYers, it includes five quick-connect nozzles, a professional spray gun, and a 16-inch steel wand, backed by extensive warranties for frame, pump, and engine. Ideal for heavy-duty cleaning tasks like deck restoration, graffiti removal, and fleet maintenance.

## Description

desertcart.com : Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) : Patio, Lawn & Garden

## Features

- Professional Performance: Easy-to-assemble and easy-to-start with its HONDA GX390 engine commercial series engine, the Aluminum Series power washer is great for contractors who specialize in deck cleaning, wood restoration, and all professional services
- Power and Durability: A powerful, reliable, maintenance-free CAT Industrial triplex plunger pump delivers 4200 PSI at 4.0 GPM and includes thermal relief to prevent overheating
- Sturdy and Portable: The aircraft grade aluminum platform with brushed extruded aluminum tubing offers durability and corrosion resistance; 13-inch premium pneumatic tires deliver ease of maneuverability across various terrain and uneven ground
- Includes Quality Simpson Accessories: Monster 3/8-inch x 50-foot high-pressure hose is kink- and abrasion-resistant; 5 Quick connect nozzle tips: 0°, 15°, 25°, 40° and Soap; 16-inch steel wand/lance; Professional spray gun with safety lock-out
- Important Notes: 49-State Compliant; Pump/Hose Connection: Threaded M22 connection

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00U77BYF6 |
| Best Sellers Rank | #50,032 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #265 in Pressure Washers |
| Brand | SIMPSON |
| Color | Red |
| Customer Reviews | 4.0 4.0 out of 5 stars (1,542) |
| Global Trade Identification Number | 00879399001345 |
| Hose Length | 50 Inches |
| Is Discontinued By Manufacturer | No |
| Item Weight | 124 pounds |
| Item model number | ALH4240 |
| Manufacturer | SIMPSON |
| Maximum Flow Rate | 4 Gallons Per Minute |
| Power Source | Gasoline |
| Product Dimensions | 38"L x 23.5"W x 29"H |
| Tank Volume | 2.5 Gallons |
| UPC | 879399001345 |
| Wand Length | 31 Inches |

## Product Details

- **Brand:** SIMPSON
- **Color:** Red
- **Global Trade Identification Number:** 00879399001345
- **Hose Length:** 50 Inches
- **Item Weight:** 124 Pounds
- **Maximum Flow Rate:** 4 Gallons Per Minute
- **Power Source:** Gasoline
- **Product Dimensions:** 38"L x 23.5"W x 29"H
- **Tank Volume:** 2.5 Gallons
- **UPC:** 879399001345

## Images

![Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) - Image 1](https://m.media-amazon.com/images/I/41q8YQtuM0L.jpg)
![Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) - Image 2](https://m.media-amazon.com/images/I/51DWHq2NoXL.jpg)
![Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) - Image 3](https://m.media-amazon.com/images/I/51PwujMxWVL.jpg)
![Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) - Image 4](https://m.media-amazon.com/images/I/51YG7pRd3XL.jpg)
![Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240) - Image 5](https://m.media-amazon.com/images/I/51b43P+YUOL.jpg)

## Questions & Answers

**Q: Does this have container for soap or chemicals?**
A: No . Not a container, it has a siphon tube that draws directly from your supplied container ..IE gallon , quart, 5 gallon container.

**Q: Does the 4200 psi model have an adjustable cat pump and chemical hose attachment?**
A: Hello! Yes, this model has an adjustable cat pump and chemical hose attachment. Thanks.

**Q: Does it include surface cleaner?**
A: No it does not

**Q: do this take a oil filter?**
A: I have a slightly different model, but no oil filter. Just change the oil regularly. Dump out on one side. Put same amount back in. Honda commercial engines are bullet proof!

## Frequently Bought Together

- Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240)
- BE Pressure 4000 PSI Whirl-A-Way Surface Cleaner Size: 20"
- Raincovo Pressure Washer Quick Connect 3/8 Inch, Pressure Washer Fittings, Adapter Set, Male Thread, 4 Pieces

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**Shop now:** [https://www.desertcart.nz/products/653578629-simpson-cleaning-4200-psi-gas-pressure-washer-4-0-gpm](https://www.desertcart.nz/products/653578629-simpson-cleaning-4200-psi-gas-pressure-washer-4-0-gpm)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-01-24*