--- product_id: 653578629 title: "Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390" brand: "simpson" price: "¥734776" currency: JPY in_stock: true category: "Simpson" url: https://www.desertcart.jp/products/653578629-simpson-aluminum-series-4200-psi-gas-pressure-washer-4-0 store_origin: JP region: Japan --- # 4200 PSI max pressure 4.0 GPM flow rate Honda GX390 engine with low-oil shutdown Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 **Brand:** simpson **Price:** ¥734776 **Availability:** ✅ In Stock ## Summary > 🚀 Clean like a pro, move like a boss! ## Quick Answers - **What is this?** Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 by simpson - **How much does it cost?** ¥734776 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/653578629-simpson-aluminum-series-4200-psi-gas-pressure-washer-4-0) ## 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 - • **Built to Last:** Aircraft-grade aluminum frame resists corrosion and keeps the unit lightweight for easy transport. - • **Pro-Grade Mobility:** 13" pneumatic tires and balanced design make moving across any terrain effortless. - • **Trusted Reliability:** Honda GX390 engine with thermal relief pump and advanced oil seal tech ensures long-lasting durability. - • **Powerhouse Performance:** 4200 PSI and 4.0 GPM deliver professional-grade cleaning power for every tough job. - • **Versatile Cleaning Arsenal:** Includes 5 quick-connect nozzles and a 50' kink-resistant hose for every surface and task. ## Overview The SIMPSON Aluminum Series 4200 PSI Gas Pressure Washer combines a powerful Honda GX390 engine with a durable CAT triplex pump and a lightweight aircraft-grade aluminum frame. Designed for professional contractors, it offers 4.0 GPM flow, a 50-foot kink-resistant hose, and five quick-connect nozzles to tackle everything from deck cleaning to graffiti removal. With premium pneumatic tires and advanced thermal protection, this pressure washer delivers unmatched performance, mobility, and reliability on any job site. ## 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 | #24,312 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #129 in Pressure Washers | | Brand Name | SIMPSON | | Color | Red | | Customer Reviews | 4.2 4.2 out of 5 stars (527) | | 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 Highlight | Gas Power Washer For Professionals. CAT Triplex Pump, 50' Hose, Aluminum Frame, 5 Nozzles. 49-State Compliant. ALH4240 | | 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 gpm | | Maximum Pressure | 4200 psi | | Model Number | ALH4240 | | Number of Items | 1 | | Number of Packs | 1 | | Power Source | Gasoline | | Tank Volume | 2.5 gallons | | UPC | 879399001345 | | Unit Count | 1 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 gpm - **Maximum Pressure:** 4200 psi - **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, 4.0 GPM, Honda GX390 - Image 1](https://m.media-amazon.com/images/I/81ggnYtX-eL.jpg) ![Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 - Image 2](https://m.media-amazon.com/images/I/51bIGTxDzGL.jpg) ![Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 - Image 3](https://m.media-amazon.com/images/I/51UDJH1fByL.jpg) ![Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 - Image 4](https://m.media-amazon.com/images/I/51QkASlPOPL.jpg) ![Simpson Aluminum Series 4200 PSI Gas Pressure Washer, 4.0 GPM, Honda GX390 - Image 5](https://m.media-amazon.com/images/I/51zh8zkg3rL.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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/653578629-simpson-aluminum-series-4200-psi-gas-pressure-washer-4-0](https://www.desertcart.jp/products/653578629-simpson-aluminum-series-4200-psi-gas-pressure-washer-4-0) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-01*