OTC 6043 Blast-Vac Multipurpose Cleaning Gun Perfectly suited for quick and efficient cooling system flushing Simply attach it to a radiator or heater hoses and youre in business Also usable in washing engines and even shop floors Two simple connections one to shop air and one to a typical water faucet creates a unique vortex air/water blast for powerful cleaning applications The tool can also be used to vacuum by turning the venturi inside the gun in the opposite direction