Features and Benefits: * Eliminates trapped air pockets which usually cause erratic cooling system and heater performance * Controls the proper amount of coolant entering system and enables unattended filling of the cooling system * Eliminates squeaky belts caused by coolant overflow and protects the environment * Angled neck allows use on radiator caps that are placed at an angle * Extension allows access to caps located under shrouds or in fender walls Includes adapter for use with threaded caps on Ford surge tanks, straight extension and an additional 45° elbow for hard-to-reach applications. Five adapters fit most domestic and import cars and light trucks. Includes threaded cap and adapter for newer GM “threaded style” radiator openings.