AllStar standard diameter radiator cap will fit 2 1/8" O.D. x 3/4" deep necks. Pressure setting is 28-32 lbs.

Radiator caps are an often-overlooked component of the cooling system that should be checked and replaced often. Higher cooling system pressure raises the boiling point of coolant to help reduce the risk of overheating. Caps allow coolant to exit the cooling system into an overflow or recovery bottle as coolant heats and expands.