Erie Tools 21" Stainless Steel Flat Concrete Deck Patio Surface Cleaner 4000 PSI Max for Hot and Cold Water Power Pressure Washer Cleaning Surface: 21 in. Maximum Working Pressure: 4000 PSI at 8 GPM Ideal for cold and hot water applications. Stainless steel housing with compact design and light-weight aluminum handle. Hover action is ideal for cleaning aggregate, stamped concrete, and other textured flat surfaces.