--- product_id: 653578629 title: "- 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: "SAR 17188" currency: SAR in_stock: true reviews_count: 6 category: "Simpson" url: https://www.desertcart.com.sa/products/653578629-4200-psi-gas-pressure-washer-4-0-gpm-commercial-power store_origin: SA region: Saudi Arabia --- # 4200 PSI max pressure 4.0 GPM water flow Honda GX390 commercial engine - 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:** SAR 17188 **Availability:** βœ… In Stock ## Summary > πŸ”₯ Unleash the beast: Pro power, pro mobility, pro results! πŸ’ͺ ## Quick Answers - **What is this?** - 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?** SAR 17188 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.sa](https://www.desertcart.com.sa/products/653578629-4200-psi-gas-pressure-washer-4-0-gpm-commercial-power) ## 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 - β€’ **Power Meets Precision:** 4200 PSI and 4.0 GPM deliver pro-grade cleaning power for every tough job. - β€’ **Lightweight Yet Rugged:** Aircraft-grade aluminum frame resists corrosion and weighs less than steel alternatives for easy transport. - β€’ **Mobility Without Limits:** 50' dual-braided hose and 13" pneumatic tires ensure smooth maneuvering on any terrain. - β€’ **Engineered for Endurance:** Honda GX390 engine with low-oil shutdown and CAT triplex pump with thermal relief for unmatched reliability. - β€’ **Versatile Cleaning Arsenal:** Includes 5 quick-connect nozzles and ergonomic spray gun to tackle everything from graffiti to deck restoration. ## Overview The SIMPSON ALH4240 is a commercial-grade gas pressure washer featuring a powerful 4200 PSI, 4.0 GPM CAT triplex pump paired with a reliable Honda GX390 engine. Built on a corrosion-resistant aircraft-grade aluminum frame, it offers superior durability and portability with a 50-foot kink-resistant hose and 13" pneumatic tires. 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 like deck restoration, graffiti removal, and equipment maintenance. Backed by multi-year warranties, this 49-state compliant machine balances power, longevity, and ease of use for demanding environments. ## 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: Class of its own - AWESOME MACHINE!! My delivery was excellent. Not one scratch or dent on the box or the machine. The assembly was so easy I just took my time and read the instructions carefully. Many nuts and bolts were loos so go over them all. The nut on the throttle was way too tight. The washer worked flawlessly on my back yard 28sq patio. So happy with my purchase. ## 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 (0Β°, 15Β°, 25Β°, 40Β°, 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 | #17,736 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #105 in Pressure Washers | | Brand Name | SIMPSON | | Color | Red | | Customer Reviews | 4.0 4.0 out of 5 stars (500) | | 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 ![- 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/818aR6nOcVL.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. ### ⭐⭐⭐⭐⭐ Class of its own *by P***R on April 17, 2026* AWESOME MACHINE!! My delivery was excellent. Not one scratch or dent on the box or the machine. The assembly was so easy I just took my time and read the instructions carefully. Many nuts and bolts were loos so go over them all. The nut on the throttle was way too tight. The washer worked flawlessly on my back yard 28sq patio. So happy with my purchase. ### ⭐ Good product, horrible delivery *by J***N on April 19, 2026* The delivery was horrible. The unit was on its side. Opened the box and the handle was bent and scratched probably from being in its side. Used a plier to bend the handle to make it fit. The unit itself works great but very disappointed that a 1,400 power washer has a bent and scratched handle from before I used it. ## 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.sa/products/653578629-4200-psi-gas-pressure-washer-4-0-gpm-commercial-power](https://www.desertcart.com.sa/products/653578629-4200-psi-gas-pressure-washer-4-0-gpm-commercial-power) --- *Product available on Desertcart Saudi Arabia* *Store origin: SA* *Last updated: 2026-04-25*