---
product_id: 653578629
title: "Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 2.5 GPM, Honda GX390 | Gas Power Washer For Professionals. CAT Triplex Pump, 50' Hose, Aluminum Frame, 5 Nozzles. 49-State Compliant. ALH4240"
brand: "simpson"
price: "€ 5598.87"
currency: EUR
in_stock: true
reviews_count: 9
category: "Simpson"
url: https://www.desertcart.hr/products/653578629-simpson-aluminum-series-4200-psi-gas-pressure-washer-2-5
store_origin: HR
region: Croatia
---

# 4200 PSI peak pressure 4.0 GPM water flow 50' kink-resistant hose Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 2.5 GPM, Honda GX390 | Gas Power Washer For Professionals. CAT Triplex Pump, 50' Hose, Aluminum Frame, 5 Nozzles. 49-State Compliant. ALH4240

**Brand:** simpson
**Price:** € 5598.87
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 2.5 GPM, Honda GX390 | Gas Power Washer For Professionals. CAT Triplex Pump, 50' Hose, Aluminum Frame, 5 Nozzles. 49-State Compliant. ALH4240 by simpson
- **How much does it cost?** € 5598.87 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-aluminum-series-4200-psi-gas-pressure-washer-2-5)

## 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

- • **Lightweight Durability:** Aircraft-grade aluminum frame resists corrosion while staying easy to maneuver.
- • **Unmatched Cleaning Power:** 4200 PSI and 4.0 GPM deliver commercial-grade performance for every tough job.
- • **Versatile Pro Accessories:** Five quick-connect nozzles plus ergonomic spray gun cover every cleaning angle with precision.
- • **Extended Reach & Protection:** 50-foot dual-braided hose with non-marring jacket keeps your workflow smooth and surfaces safe.
- • **Honda GX390 Engine Reliability:** Effortless starts and low-oil shutdown for worry-free operation on site.

## Overview

The Simpson ALH4240 is a commercial-grade gas pressure washer featuring a robust Honda GX390 engine paired with a CAT triplex plunger pump delivering 4200 PSI at 4.0 GPM. Built on a corrosion-resistant aircraft-grade aluminum frame, it offers superior mobility with 13" pneumatic tires and a 50-foot kink-resistant hose. Designed for contractors and serious DIYers, it includes five quick-connect nozzles and a professional spray gun, making it ideal for heavy-duty cleaning tasks from decks to graffiti removal. Backed by multi-year warranties, this 49-state compliant unit balances power, durability, and ease of use for unmatched cleaning performance.

## 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.

Review: This thing is a beast! - I read a LOT of reviews here on desertcart and other online resources before deciding to make such a sizable investment in this 4200 PSI/4.0 GPM machine. This is not my first pressure washer, but my third actually. Each time I upgraded in both PSI and gallons per minute. This is my first pressure washer that is categorized as commercial use. Having finally taken the time to put this machine to the test, I can honestly say this thing has more than enough power to satisfy the average homeowner or DIY’er. As I said in the title: this thing is a beast! Mine arrived complete and undamaged. Other reviewers reported scratches and dents but that was not my experience at all. Assembly was quick and easy. My shipment contained a quart of Amsoil synthetic 10W-30 for the engine crankcase but I have seen other reviewers that got their oil in a plastic pouch. Once assembled, the crankcase filled with the supplied oil, and the fuel tank filled 1/2 way, I hooked up the garden hose and bled the air out for 30+ seconds as recommended. Set the throttle to half-way and closed the choke and gave the starter a quick pull and it fired right up on the first attempt. After allowing the engine to run at partial throttle with the trigger open to keep the water flowing and the pump cooled for a few minutes, I increased the engine speed to approximately 3/4 and started cleaning the concrete patio as my first project with this unit. The pressure even at less than wide open on the Honda GX390 was more than enough to get the accumulated grime blasted off effortlessly. Next up, I connected my 15” surface cleaner which really sped up the process. The 4240 pressure and water flow are a perfect match for the Karcher 15” surface cleaner. With all of the positive attributes of this machine, there is one thing that I feel is a negative: the hose. It’s more than long enough for most jobs but the stiffness makes moving around with it a real challenge. Given the higher than average PSI capabilities of the ALH-4240 it’s not surprising that the pressure hose is more on the stiff side, but as others have commented, it would be a good idea to upgrade to a better hose. Honestly, at this price point, a better quality hose should come with it. Overall, the ALH-4240 is a great pressure washer that has all of the power that the average person could want for DIY use. The high PSI and GPM make short work out of even the toughest cleaning projects. Time will tell if it lives up to the Simpson advertised claims of dependability and reliability.
Review: Powerful, Dependable Power Washer - Purchased this power washer for home use and was not disappointed. The unit is very powerful, yet easy to handle. I selected this unit for high PSI, GPM and its Honda engine, which is always great quality.

## 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 | #27,872 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #155 in Pressure Washers |
| Brand | SIMPSON |
| Brand Name | SIMPSON |
| Color | Red |
| Customer Reviews | 4.2 out of 5 stars 567 Reviews |
| 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 |
| Product Dimensions | 38"L x 23.5"W x 29"H |
| 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 Aluminum Series 4200 PSI Gas Pressure Washer, 2.5 GPM, Honda GX390 | Gas Power Washer For Professionals. CAT Triplex Pump, 50' Hose, Aluminum Frame, 5 Nozzles. 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!

## Customer Reviews

### ⭐⭐⭐⭐⭐ This thing is a beast!
*by K***. on September 17, 2024*

I read a LOT of reviews here on Amazon and other online resources before deciding to make such a sizable investment in this 4200 PSI/4.0 GPM machine. This is not my first pressure washer, but my third actually. Each time I upgraded in both PSI and gallons per minute. This is my first pressure washer that is categorized as commercial use. Having finally taken the time to put this machine to the test, I can honestly say this thing has more than enough power to satisfy the average homeowner or DIY’er. As I said in the title: this thing is a beast! Mine arrived complete and undamaged. Other reviewers reported scratches and dents but that was not my experience at all. Assembly was quick and easy. My shipment contained a quart of Amsoil synthetic 10W-30 for the engine crankcase but I have seen other reviewers that got their oil in a plastic pouch. Once assembled, the crankcase filled with the supplied oil, and the fuel tank filled 1/2 way, I hooked up the garden hose and bled the air out for 30+ seconds as recommended. Set the throttle to half-way and closed the choke and gave the starter a quick pull and it fired right up on the first attempt. After allowing the engine to run at partial throttle with the trigger open to keep the water flowing and the pump cooled for a few minutes, I increased the engine speed to approximately 3/4 and started cleaning the concrete patio as my first project with this unit. The pressure even at less than wide open on the Honda GX390 was more than enough to get the accumulated grime blasted off effortlessly. Next up, I connected my 15” surface cleaner which really sped up the process. The 4240 pressure and water flow are a perfect match for the Karcher 15” surface cleaner. With all of the positive attributes of this machine, there is one thing that I feel is a negative: the hose. It’s more than long enough for most jobs but the stiffness makes moving around with it a real challenge. Given the higher than average PSI capabilities of the ALH-4240 it’s not surprising that the pressure hose is more on the stiff side, but as others have commented, it would be a good idea to upgrade to a better hose. Honestly, at this price point, a better quality hose should come with it. Overall, the ALH-4240 is a great pressure washer that has all of the power that the average person could want for DIY use. The high PSI and GPM make short work out of even the toughest cleaning projects. Time will tell if it lives up to the Simpson advertised claims of dependability and reliability.

### ⭐⭐⭐⭐⭐ Powerful, Dependable Power Washer
*by P***D on June 28, 2026*

Purchased this power washer for home use and was not disappointed. The unit is very powerful, yet easy to handle. I selected this unit for high PSI, GPM and its Honda engine, which is always great quality.

### ⭐⭐⭐⭐⭐ Great machine in terrible packaging.
*by M***N on May 13, 2026*

Very powerful and well built machine. I am glad that I did not purchase a less powerful unit. I was disappointed with two things: 1: The shipping box does not indicate which end is up, so the delivery driver plopped it down on its side. The exhaust guard was damaged but fixable. There is very little padding inside the box, so I am sure this happens a lot. 2: the engine bolts came loose from the mounting plate during my first use. I thought it sounded a little rattle and then moved it and saw the nuts laying on the ground. Better licking hardware should come on every unit, but especially one claiming to be for commercial use. Overall, a very nice piece of equipment.

## 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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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-29*