---
product_id: 653578629
title: "Simpson 4200 PSI Gas Pressure Washer, 4.0 GPM Commercial Power Washer, Cold Water, Honda GX390 Engine, 50' Hose, Aluminum Series, 49-State Compliant (ALH4240)"
brand: "simpson"
price: "€ 3592.62"
currency: EUR
in_stock: true
category: "Simpson"
url: https://www.desertcart.hr/products/653578629-simpson-4200-psi-gas-pressure-washer-4-0-gpm-commercial
store_origin: HR
region: Croatia
---

# 4.0 GPM flow rate 4200 PSI max pressure 50' kink-resistant hose Simpson 4200 PSI Gas Pressure Washer, 4.0 GPM Commercial Power Washer, Cold Water, Honda GX390 Engine, 50' Hose, Aluminum Series, 49-State Compliant (ALH4240)

**Brand:** simpson
**Price:** € 3592.62
**Availability:** ✅ In Stock

## Summary

> 🚀 Clean Like a Pro, Wherever the Job Takes You

## Quick Answers

- **What is this?** Simpson 4200 PSI Gas Pressure Washer, 4.0 GPM Commercial Power Washer, Cold Water, Honda GX390 Engine, 50' Hose, Aluminum Series, 49-State Compliant (ALH4240) by simpson
- **How much does it cost?** € 3592.62 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/653578629-simpson-4200-psi-gas-pressure-washer-4-0-gpm-commercial)

## 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

- • **Powerhouse Performance:** 4200 PSI and 4.0 GPM deliver pro-grade cleaning power for every tough job.
- • **Versatile Pro Accessories:** Five quick-connect nozzles plus ergonomic spray gun cover every cleaning scenario with ease.
- • **Extended Reach & Protection:** 50-foot dual-braided hose with non-marring jacket means no limits and no surface damage.
- • **Ultra-Durable Aluminum Frame:** Aircraft-grade aluminum keeps it lightweight yet corrosion-resistant for long-term use.
- • **Honda GX390 Engine Reliability:** Effortless starts and low-oil shutdown protect your investment on site.

## Overview

The SIMPSON Aluminum Series 4200 PSI Gas Pressure Washer combines a powerful Honda GX390 engine with a commercial-grade CAT triplex pump to deliver 4.0 GPM of cold water cleaning power. Its aircraft-grade aluminum frame ensures lightweight durability and corrosion resistance, while the 50-foot kink-resistant hose and five quick-connect nozzles provide unmatched versatility. Designed for contractors and professionals, this pressure washer offers easy mobility with premium pneumatic tires and a balanced layout, backed by multi-year warranties for engine, pump, and frame.

## Description

The SIMPSON Aluminum Series pressure washer 4200 PSI at 4.0 GPM is great for construction, equipment upkeep, and facility and fleet maintenance cleaning. With a powerful HONDA GX390 engine, reliable CAT triplex pump, and ultra lightweight aircraft grade aluminum frame, this pressure washer is the optimum blend of maneuverability and performance. The ALH4240 also comes with a 50’ hose, ergonomic spray gun, and 5 Quick Connect nozzles. Designed to meet the rigorous demands of the cleaning professional, the SIMPSON Aluminum Series frame is crafted of 100% aircraft grade aluminum, making it lighter in weight than most steel frame pressure washer designs. Perfect for contractors who specialize in deck cleaning, wood restoration, paint preparation, graffiti removal and all other professional cleaning services. The SIMPSON Aluminum Series designed for optimum performance in the harshest environments. Easy-to-assemble and easy-to-start, the Aluminum Series power washer is great for contractors who specialize in deck cleaning, wood restoration, and all professional services. 10 Year Limited Frame Warranty, 5 Year Limited Pump Warranty, 3 Year Limited Engine Warranty. Includes: Pressure Washer, Hose, Gun, Wand, 5 Quick connect nozzle tips, Detergent siphon tube with filter, Engine Oil, Quick start set up guide, Owner's manual.

## Features

- SIMPSON PRESSURE WASHER FOR PROFESSIONALS: The Simpson Aluminum Series gas power washer cleans decks, driveways, siding, fencing, equipment, and graffiti; The cold water machine is great for contractors; 49-State Compliant (Not for sale in California)
- ENGINE & PUMP: HONDA GX390 engine starts easily & includes low-oil shutdown; 4200 PSI 4.0 GPM CAT triplex plunger pump includes thermal relief to prevent overheating; Advanced oil seal technology & ceramic coated pistons extend seal life
- LONG HOSE REACH: The Simpson Monster series 50' dual-braided high-pressure hose resists kinks and abrasion; Non-marring polyurethane jacket helps protect finished surfaces; Threaded M22 pump/hose connection
- EASY MOBILITY: 13" premium pneumatic tires roll smoothly over gravel, grass, and curbs; Balanced layout improves transport; Aircraft grade aluminum frame with powder-coated finish is easy to assemble and resists corrosion; 38" L x 23.5" W x 29" H; 133 lb
- PRO PRESSURE WASHER ACCESSORIES: Five quick-connect pressure washer tips (0°, 15°, 25°, 40°, and soap nozzle) cover tasks from stripping paint to car cleaning; Professional QC spray gun with safety lock-out and 16" spray wand included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00U77BYF6 |
| Best Sellers Rank | #24,055 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #167 in Pressure Washers |
| Brand Name | SIMPSON |
| Color | Red |
| Customer Reviews | 4.2 4.2 out of 5 stars (561) |
| Global Trade Identification Number | 00879399001345 |
| Hose Length | 50 Inches |
| Included Components | Aluminum 4200PSI,4.0GPM,Gas GX390 |
| Item Dimensions L x W x H | 38"L x 23.5"W x 29"H |
| Item Type Name | Gas Pressure Washer, 4.0 GPM Commercial Power Washer, Cold Water, Honda GX390 Engine, 50' Hose, Aluminum Series, 49-State Compliant (ALH3228-S) |
| Item Weight | 124 Pounds |
| Manufacturer | SIMPSON |
| Manufacturer Part Number | ALH4240 |
| Manufacturer Warranty Description | Warranty Details: Engine - 3 Year Limited Commercial Warranty | Pump - 5 Year Limited Warranty | Frame - 1 Year Limited Warranty |
| Maximum Flow Rate | 4 Gallons Per Minute |
| Maximum Pressure | 4200 Pound per Square Inch |
| Model Number | ALH4240 |
| Power Source | Gasoline |
| Tank Volume | 2.5 Gallons |
| UPC | 879399001345 |
| Unit Count | 1.0 Count |
| 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
- **Maximum Pressure:** 4200 Pound per Square Inch
- **Power Source:** Gasoline
- **Product Dimensions:** 38"L x 23.5"W x 29"H
- **Tank Volume:** 2.5 Gallons

## Images

![Simpson 4200 PSI Gas Pressure Washer, 4.0 GPM Commercial Power Washer, Cold Water, Honda GX390 Engine, 50' Hose, Aluminum Series, 49-State Compliant (ALH4240) - Image 1](https://m.media-amazon.com/images/I/81ggnYtX-eL.jpg)

## Available Options

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

## 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.hr/products/653578629-simpson-4200-psi-gas-pressure-washer-4-0-gpm-commercial](https://www.desertcart.hr/products/653578629-simpson-4200-psi-gas-pressure-washer-4-0-gpm-commercial)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-05*