Features: 1¡¢Using high?quality silicone rubber, good sealing, can effectively prevent the radiator from leaking. 2¡¢The radiator cover is used to adjust the radiator pressure and maintain the water level of the water tank. 3¡¢Improve the radiator pressure and cooling performance while modifying the appearance of the engine compartment. 4¡¢Thermostatic radiator cover, once the discharge pressure is over 0.9KG, the radiator cover spring will open, and the coolant will flow to the auxiliary radiator for storage. 5¡¢As the water temperature decreases, a vacuum is formed inside, the cap will open to draw water from the auxiliary radiator into the water tank to keep the water level balanced. Item Type: Thermostatic Radiator Cap Material: Aluminum Alloy + Silicone Rubber Color: Dark Blue + Black Size: Approx. 65 x 45mm/2.6 x 0.8in Application: Universal Package Included: 1 x&nbspThermostatic Radiator Cap