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The radiator cap is designed with a water temperature gauge, which can show whether it is safe to open the radiator cap. Prevent water leakage from the water tank, adjust the pressure balance of the water tank and keep the water level balanced. No need to start the engine to let you know the exact temperature of the tank. Silicone material inner plug, increases heat resistance temperature and increases the closeness of the cap. Easy to install. Just take the old cap out, and bolt on this new one.