Woody Wax Engine Flush Treatment removes salt, scale, and built-up mineral deposits. It places the ultimate corrosion protection throughout your cooling system, while also lubricating the water pump impeller, thermostat, and internal cooling parts. The easy-to-use injector dispenses just the right amount of engine flush. Attaches easily to your engine's existing freshwater flush or with external ear muffs. Boat soap has a universal hose end which makes washing effortless. Use it to soap or rinse, no mixing or bucket needed. Kit includes one brass injector, one brass spray nozzle, four 2-oz. flush cartridges, two 2-oz. boat soap cartridges, and storage box.