Meets OSHA standards. Virtually maintenance free. Aluminum safety tip nozzle: Air - 3/4" FNPT inlet. Heavy-duty adjustable auxiliary handle. Heavy-duty HydroForce power washer combines compressed air and standard municipal utility water to generate superior cleaning power. Hot or cold water capable. No external pressure unit or power package: requires no electricity, or gasoline. Perfect for mobile applications where portability is at a premium. Rugged, lightweight, ergonomic aluminum handle. Single trigger operation provides convenient air/water operation.