Item Type: Thermostatic Radiator Cap_x005F_x000D_Material: Aluminum Alloy + Silicone Rubber_x005F_x000D_Color: Dark Blue + Black_x005F_x000D_Size: Approx. 65 x 45mm/2.6 x 0.8in_x005F_x000D_Application: Universal 1Using high?quality silicone rubber, good sealing, can effectively prevent the radiator from leaking. 2The radiator cover is used to adjust the radiator pressure and maintain the water level of the water tank. 3Improve the radiator pressure and cooling performance while modifying the appearance of the engine compartment. 4Thermostatic 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. 5As 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.1 xThermostatic Radiator Cap