-Enables unattended filling of the cooling system -Saves time and eliminates spills and mess -An additional adapter and threaded cap have been added to the set to fit screw on style adapters found on many newer GM vehicles -Eliminates trapped air pockets which usually cause erratic cooling system and heater performance -Fits most domestic and import cars and light trucks The Spill Free Funnel is used to fill coolant into the cooling system. It controls the proper amount of coolant entering system and enables unattended filling of the cooling system. The funnel eliminates squeaky belts caused by coolant overflow and protects the environment. Angled neck allows use on radiator caps that are placed at an angle. Protects the environment. Supersedes Lisle #22150.