The Carlyle Tools Cooling System Power Flush Gun, No. SER 70801, is designed to flush complete cooling system, including heater core, quickly and efficiently with no need for chemicals or solvents. Its patented design, Spiral Air Venturi, creates powerful high volume water flow and its design includes stepped fitting for varied hose diameters from 3/4” to 2”. The tool is easy to use with quick connect fittings for shop air and standard water tap, and has user control functions for water flow control and air control trigger. Manufactured from lightweight, high-strength composite materials with very high corrosion resistance.