The Spill-Free Funnel eliminates trapped air pockets which usually cause erratic cooling system and heater performance. 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 protect the environment. Five adapters fit most domestic and import cars, light trucks and Ford vehicles. Straight extension and 45 degree elbows allow use on radiator caps that are placed at an angle or other hard-to-reach applications.