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SIMPSON

Simpson Aluminum Series 3600 PSI Gas Pressure Washer, 2.5 GPM, Honda GX200 | Gas Power Washer For Professionals. AAA Triplex Pump, 35' Hose, 5 Nozzles, Steel Frame. 49-State Compliant. ALH3425

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Availability: In Stock.
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Arrives Thursday, Aug 6
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Style: 3600 PSI


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 GX200 engine starts easily & includes low-oil shutdown; 3600 PSI 2.5 GPM AAA triplex plunger pump features integrated unloader; Thermal relief prevents overheating; PowerBoost Technology delivers higher pressure at the nozzle
  • LONG HOSE REACH: The Simpson Morflex series 35' high-pressure hose is non-marring, flexible and abrasion-resistant; Pump/Hose Connection: Threaded M22 connection
  • EASY MOBILITY: 10" 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; 21" L x 24" W x 34" H; 78 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

Description

Built for pros, the SIMPSON Aluminum Series ALH3425 delivers 3,600 PSI at 2.5 GPM for fast, deep cleaning. Honda’s GX200 commercial engine teams with a maintenance-free AAA industrial triplex pump with PowerBoost for higher pressure at the nozzle. The aircraft-grade aluminum frame with brushed, extruded tubing resists corrosion and cuts weight, while 10" pneumatic tires roll easily over jobsite terrain. Includes a 35-ft MorFlex 5/16" high-pressure hose (non-marring, kink and abrasion resistant), ergonomic professional spray gun with safety lock-out, 16" steel wand, and 5 quick-connect nozzles (0°, 15°, 25°, 40°, soap). Threaded M22 connections speed setup; thermal relief helps prevent overheating. 49-state compliant and easy to start, this cold- water gas power washer is ideal for contractors handling deck cleaning, wood restoration, paint prep, equipment and concrete.

Brand: SIMPSON


Power Source: Gas Powered


Color: Black & Red


Item Weight: 35.83 kg


Hose Length: 25 feet


Specification Met: CARB, 49-State Compliant


Product Dimensions: 30"L x 24"W x 21"H


Tank Volume: 2.5 gallons


Maximum Flow Rate: 2.5 gpm


Global Trade Identification Number: 52


Item Weight: 35.83 kg


Hose Length: 25 feet


Item Dimensions L x W x H: 30"L x 24"W x 21"H


Tank Volume: 2.5 gallons


Power Source: Gas Powered


Maximum Flow Rate: 2.5 gpm


Maximum Pressure: 3400 psi


Specification Met: CARB, 49-State Compliant


Color: Black & Red


Brand Name: SIMPSON


Model Number: ALH3425


Global Trade Identification Number: 52


UPC: 879399001826 879399001352


Unit Count: 1 Count


Manufacturer Warranty Description: 3 year engine, 5 year pump, 10 year frame


Included Components: SIMPSON Cleaning ALH3425 Aluminum Gas Pressure Washer


Item Type Name: Gas Pressure Washer, 2.5 GPM Commercial Power Washer, Cold Water, Honda GX200 Engine, 35' Hose, Aluminum Series, 49-State Compliant (ALH3425)


Manufacturer: Simpson Cleaning


Manufacturer Part Number: 60689


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Aug 6

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews

    • Excellent pressure washer, well worth the price.
I've been a homeowner for 30 years and this is the best pressure washer I've ever owned. It's powerful and runs great, but is surprisingly light and compact, making it easy to move around and store. It feels well-built and durable, and the Honda engine starts easily on the first pull. I didn't even need to use the choke. I used it for over 4 hours this weekend and I'm impressed. I'm very happy with this purchase and would recommend it without hesitation. ... show more
Reviewed in the United States on July 13, 2026 by EricP
    • Great Pressure Washer
The SIMPSON ALH3425 is a powerful and reliable commercial-grade pressure washer. The Honda GX200 engine starts easily, runs smoothly, and delivers consistent performance. Lightweight aluminum construction, a long 35' hose, and strong 3600 PSI cleaning power make it perfect for professional use. Highly recommended for anyone looking for durability, reliability, and excellent cleaning results. ... show more
Reviewed in the United States on June 1, 2026 by Edgar O Medina
    • THIS IS A NICE UNIT
Just received my pressure washer. It was well packed and got to me in perfect condition. It was easy to put together. Only wish simpson would include quick disconnects on each end of hose. It’s a PIA to sort through all these fittings that just might work but don’t. The unit starts right up and has plenty of power to remove grease and oil on my driveway. ... show more
Reviewed in the United States on June 6, 2026 by skipperw
    • Great Quality And Powerful Product
The engine starts right away without any issues. Product works great on driveways, walls, cars, and all other stubborn dirt. The size is appropriate. It can fit just about anywhere. I strongly recommend the Simpson 3600 PSI Gas Pressure Washer, 2.5 GPM Commercial Power Washer
Reviewed in the United States on June 22, 2026 by Sanon Lezeau
    • Quality product, well packaged, straightforward assembly
Package arrived in great condition. Was well protected in boxing. Assembly relatively easy & straightforward. Have not used yet but seems not complex to operate. Had to order an adapter to be able to connect my surface cleaner scrubber, might suggest including those with purchase.
Reviewed in the United States on May 17, 2026 by TH
    • Its a heavy duty machine that is worth the price.
Power washer came as advertised. It was an easy assembly. We added the oil, fueled it up and it started right up without any issues. We used it all day on my 5 acre farm. The Honda motor has plenty of power. I would recommend this to anyone.
Reviewed in the United States on July 1, 2026 by Glenn Lolli
    • would not run :(
Purchased this machine because it had the Honda GX engine & because it was made in the USA! Have several other Honda powered pieces of equipment that have been reliable, easy start and trouble free. However, this SIMPSON power washer would not start I should say, after about 5 tries it did start several times but then immediately died Took me repeated tries (nearly an hour) with waiting, in case it was flooded, between tries. Once I did finally get it started I could not adjust the choke or throttle, as suggested in the manual, without the machine dying . The machine only ran for a few minutes before it began backfiring. It would only run without backfiring if the water wand was kept in the washing position at all times. I could not take my hand off the wand handle or the machine would backfire. After calling the help line their only suggestion was for me to take this brand new machine into the repair shop. It was Saturday, mid day by this time, and the repair shop did not have a repair person available to help so would have to leave it for them to look at in a few days or so. Out of frustration I tried to go ahead and continue using it and kept the power wand in the open-wash position but gradually the machine started backfiring anyway. I turned it off and let it rest thinking maybe it was hot (my previous power washer - 15 years old - would run and run until out of gas, then I would let it rest and cool before re-filling the gas tank.) After turning it off, I was not able to restart it again. I had hired a couple young men to come help me move items, power wash under & behind, then return the items to their proper place. Many of the things had already been moved. I Needed to get power washing under and behind before returning them to their place. I had already been paying for them to stand around while trying to get the machine started then trouble shoot on the phone. I had to go buy a Costco power washer so I could get the work done while I had helpers!!! Now the company whom sent this is saying it can not be shipped after oil & gas have been added. It had oil in the pump when it was shipped so this does not ring true. Besides I can completely empty the gas and let any residual evaporate and the oil can be drained. I do not need 2 power washers and certainly not one that doesn't work! Needless to say I am not a happy camper right now! I purchased this through AMAZON so hopefully their guarantee will help me with this problem. P.S. This machine is now on line for $100.00 less than my purchase price :( ... show more
Reviewed in the United States on August 21, 2019 by Valerie G.
    • Well made great machine
Solid well made washer. Starts first or second pull with plenty of flow for all but the most pro uses.
Reviewed in the United States on June 24, 2026 by DEANE P.

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