A Double Shot Of Clean The new Double-Shot Pressure Washer Pistol from RBL Products combines air pressure and water with a variety of cleaning and degreasing chemicals to power clean and power rinse. The unit has a working pressure range of 30-150 psi allows for safer, up-close power washing, as well as adjusting pressure higher to lift excessive dirt build up from narrow openings and tight seams. The Double-Shot requires compressed air and water hook-ups.