Mr.Gasket Thermocap Blue Engine Coolant Radiator Caps are designed by combining the high-pressure radiator cap with a thermometer element. This helps you to simply check the integrated temperature gauge to ensure a safe way to remove the cap. Manufactured from aluminum they are available in your choice of red, blue, or silver anodized finishes. The Mr.Gasket Thermocap radiator caps read the temperature in both Fahrenheit and Celsius to suit any vehicle's needs. Changing your old stock cap is very easy and requires no tools or modifications. Mr. Gasket Thermocap radiator caps ensure that you stay safe each and every time and offer the fastest, easiest way to know exactly when it's safe to open your radiator cap.