The BE-1800WAW Whirl-A-Way cleans flat surfaces quickly, easily, and evenly. Use it, along with a power washer, to clean large flat surfaces such as long driveways, parking lots, rooftops, or pool decks. This flat surface cleaner prevents zebra striping and increases your cleaning time by up to sixty percent over a regular nozzle. This model has zero wall clearance cleaning - 4,000 PSI Max Pressure (275 BAR) - 8.0 GPM Max Flow - 180 degree F Maximum Temperature - 18 inch Diameter size - Four 2-1/2 inch casters - 2 Arm design - Trigger Gun Inlet: 3/8 QC Plug - Note: Works best with a 6.5HP engine/ 3.0 GPM or greater