Radiator Cap Tester Adapter

Your radiator cap keeps pressurized coolant from escaping the system, and allows you to top off your coolant if the level is too low. The radiator cap includes a seal and a spring to maintain pressure in the cooling system and allow hot coolant to run to the reservoir tank when it expands. To test the function of the cap, a radiator cap tester is used to pressurize the cap using compressed air. For different radiator cap sizes and styles, specific adapters can be used to fit your radiator cap to the tester. If the cap does not handle the specified pressure, it should be replaced to prevent damage to the cooling system or leaks. If you need a radiator cap tester, adapter, or even a new radiator cap, check out the options at O'Reilly Auto Parts.