Allstar Performance High-Pressure Radiator Caps allows your cooling system to operate at a higher pressure. This raises the boiling point of coolant and greatly reduces the risk of overheating your race car. Standard size radiator caps fit 2-1/8' in. OD x 3/4' in. deep necks unless otherwise noted. Recovery system caps allow coolant to exit the cooling system into an overflow or recovery bottle as coolant heats and expands. As the system cools, recovery system caps will draw coolant back in to keep the cooling system full. Non-recovery system caps allow coolant to exit but do not draw coolant back into the system. High-pressure radiator caps are made for use on race vehicles only.

Note: Do not use high-pressure caps on passenger vehicle cars with OEM style radiators.