Features: 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. 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