The Simpson PowerShot 4000 PSI at 3.5 GPM is designed to meet the rigorous demands of the cleaning pro. Heavy-duty pressure washers with flow and reliability. Perfect for contractors who specialize in deck cleaning, wood restoration, paint preparation, graffiti removal and all other professional cleaning services. Equipped with premium Honda engines built with high-quality components, designed for optimum performance and renowned for being easy to start. AAA industrial triplex pumps with patent-pending PowerBoost Technology provide higher pressure at the nozzle resulting in greater impact and cleaning performance.