Features and Benefits: Refills entire cooling system in seconds including the Heater Core; No more system bleeding; Checks for leaks while under vacuum; Easy to operate Push Button Valve eliminates the need to change hoses; Works on all cooling systems with "Fits-All" Cone Adapter; Eliminates airlocks and refills entire cooling system in seconds including heater core. No more system bleeding. Also checks for leaks. Uses shop air. Works on all cooling systems with cone adapter.