











💥 Power through dirt like a pro with SIMPSON’s unstoppable pressure washer!
The SIMPSON ALH4240 Aluminum Gas Pressure Washer features a robust Honda GX390 engine delivering 4200 PSI at 4.0 GPM, paired with a Cat industrial Triplex plunger pump. Its aircraft-grade aluminum frame and 50 ft non-marring hose provide durability and ease of use, while five quick-connect nozzles offer versatile cleaning options. Designed for professionals and serious DIYers, this pressure washer combines power, reliability, and mobility with premium pneumatic wheels and a 31-inch steel wand.























| ASIN | B00U77BYF6 |
| Brand | SIMPSON |
| Colour | Red |
| Customer Reviews | 4.2 out of 5 stars 1,073 Reviews |
| Global Trade Identification Number | 00879399001345 |
| Hose Length | 50 Inches |
| Item Type Name | Gas Pressure Washer Powered by HONDA GX390 |
| Item Weight | 124 Pounds |
| Manufacturer | SIMPSON |
| Manufacturer Part Number | ALH4240 |
| Maximum Flow Rate | 4 Gallons Per Minute |
| Maximum Pressure | 4200 Pound per Square Inch |
| Model Number | ALH4240 |
| Power Source | Gasoline |
| Specification Met | CE, CSA |
| Tank Volume | 4 Gallons |
| UPC | 879399001345 |
G**D
Vary good pressure washer
Works well, nice and light. great if you want to throw it in the back of your truck
B**H
🤔
B**G
Powerful, easy to start
Started first pull. And has started on the first pull every time. I can definitely tell a power difference between this one and my other pressure washer with the same specs. Everything on this just looks and feels professional and high quality. The Aluminum cart is the icing on the cake! The only thing I didn’t like was the wand and the hose. The wand is way too bulky and too much plastic. The hose is decent but not very flexible. They just didn’t match the pressure washer. I would suggest in Investing in a high quality wand and hose and use what it came with for spares.
T**M
Strong and reliable (detailed review over the year)
Wanted to wait for some time to pass before making a real a review on my pressure washer. Purchased in sep 2021 and it’s now Jan 2025, so I have used it for 3 warm seasons since I only use it during the warmer months in PA. Did A LOT of researching before pulling the trigger on getting this unit. Some might think it’s expensive for someone who may only use it for home use and not commercial, but it’s perfect and reliable! I wanted something that would be versatile and beneficial with all projects. I always do the recommended maintenance and when storing for winter I winterize it. Maintenance is key for anything and I believe taking care of this will make it last for years of use. Main selling points for me and things I like: - CAT AAA pump, Honda engine, warranty, GPM, heavy duty but “light weight” frame/wheels, and being able to not worry about damaging the pressure washer if you release the handle while it’s running (not something I do often but know that’s a big no no when it comes to other pressure washers that don’t have the feature to allow this. High PSI and also the ability to lower the rpm’s to use it for lighter duty tasks. My complaints over the years: - The rubber feet that come with this unit are garbage, plan on replacing them with bigger and better feet because these ones will not last and the pressure washer will walk around on you. - I wish there was a better design for changing the oil, it’s a pain in the butt but with the right set up it wouldn’t be a big deal - It a little awkward when wheeling it around but it’s not a big deal and is only heavy if you are picking it up by yourself to go up stairs or things like that. Overall I would highly recommend this and would purchase again! Hope this helps you :)
M**N
Great machine in terrible packaging.
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.
Trustpilot
3 weeks ago
1 week ago