Multi-Purpose Cleaning Gun. Simply hook up the Blast-Vac Multipurpose Cleaning gun to your garden hose, and turn your air compressor into a pressure washer. Works great on many chores from flushing radiator and cooling system to cleaning engine compartments. Includes Blast/Vac gun, vacuum attachment, Water valve assembly, garden hose quick-disconnect and instructions. For easy pressure washing install the optional detergent attachment. Chemical and corrosion resistant construction makes this accessory appropriate for most water based cleaners. Req air compressor 100p.s.i. max. Use with Metal Wash.