Features and Benefits:Fits Domestic & Import Master Cylinder Reservoirs;360 Degree Swivel Typical Automotive Style Air Hose Nipple;Expandable O-Ring for a Leak-Free Seal;Aluminum Body;Color Coded;3 Tab adapter with Expandable O-Ring for GM, Chevrolet, Cadillac, Pontiac, Daewoo and Mazda vehicles. Expandable O-Ring ensures a leak-free seal. 1.22 - 1.42 Inch Diameter.