The Lisle Heater Core Backflush Tool, No. 60900, is an adjustable-pressure industrial spray gun with a stepped-tip design for easy heater core flushing. The tip fits 1/2", 5/8" and 3/4" hose fittings. Water pressure can be easily controlled with one hand by squeezing the handle of the heavy duty spray gun. The insulated handle protects hands when using hot water to flush the cooling system. The spray gun attaches to a standard garden hose. This is made in the U.S.A.