SIMPSON® ALH4240 | 4200 PSI Pressure Washer


$1,109.99 $1,199.00
SKU: 60688



SIMPSON® ALH4240 | 4200 PSI 4.0 GPM Gas Pressure Washer Powered by Honda GX390 OHV Engine (CARB Compliant)


The SIMPSON® Aluminum Series pressure washer 4200 PSI @ 4.0 GPM is built to perform. With a powerful Honda engine, reliable triplex pump and ultra lightweight aircraft grade aluminum frame, this gas pressure washer is great for construction, equipment upkeep, facility & fleet maintenance cleaning.

The ALH4240 is powered by a Honda engine and comes with a 50’ hose, Dial-N-Wash adjustable spray gun and 5 Quick Connect nozzles.


  • 4200 PSI @ 4.0 GPM
  • HONDA® GX390 engine with low oil shutdown
  • CAT PUMPS® Industrial triplex plunger pump
  • Monster Hose 3/8" x 50′ is kink and abrasion resistant and equipped with quick connect
  • Ergonomic spray gun designed for comfort and control
  • 5 Quick connect nozzle tips: 0°, 15°, 25°, 40° and Soap
  • Aircraft grade aluminum frame with brushed extruded aluminum tubing
  • 13" Premium pneumatic tires 


SIMPSON® Aluminum Frame

Designed to meet the rigorous demands of the cleaning pro.

  • Lighter in weight than most steel-frame designs, the Aluminum Series frame is crafted of 100% professional grade aluminum.
  • Perfect for contractors who specialize in deck cleaning, wood restoration, paint preparation, graffiti removal and all other professional cleaning services.
  • For those extra dirty jobs, drop the detergent siphoning tube into pressure washer safe detergent and attach the soap applicator nozzle.



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