Mr. Gasket 2470B Domestic ThermoCap Radiator Cap With A Temperature Guage. Combines a pressurized radiator cap with a thermometer element that eliminates potentially dangerous guesswork Lets you know exactly when your coolant temperature is low enough to safely open your radiator cap To install just take off your old cap and screw on the new one If the temperature gauge indicates that the coolant is too hot just rinse the radiator with cool water until the temperature drops into a safe zone Also available in red (part number 2470R) and silver (part number 2470S)