The Matco Tools Cooling System Power Flush Gun, No. HCBFAIR, is an adjustable industrial water spray gun with air assist attached to the stepped tip design for easy heater core flushing. Air pressure is added to the water flow that pulsates to flush out stubborn clogs. The spray gun attaches to a standard garden hose. Water pressure can be easily controlled with one hand by squeezing the handle of the heavy-duty spray gun. The insulated handle protects user's hands when using hot water to flush the cooling system. The tip fits 1/2", 5/8", and 3/4" hose fittings.