The Homelite 21 in. Surface Cleaner Attachment for Gas Pressure Washers may be used with gas pressure washers up to 4,000-PSI. It comes with a 3/8 in. quick-connect coupler so it may be easily attached and removed. The surface cleaner features a 21 in. deck with rotating spray-nozzles to help clean surfaces quickly. It stainless-steel construction helps provide durability. Simply push it across surfaces with its 4 casters.