Features and Benefits: Adjustable Pressure Industrial Spray Gun and 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 your hand when using hot water to flush the cooling system; The spray gun attaches to a standard garden hose; Adjustable Pressure Industrial Spray Gun and Stepped Tip Design for Easy Heater Core Flushing.The tip fits 1/2 in.;, 5/8 in.; and 3/4 in.; 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 your hand when using hot water to flush the cooling system. The spray gun attaches to a standard garden hose.