Material: Silicone + Aluminum Alloy Color: As shown in the picture 1. Thermost Radiator Cap can automatically adjust the water temperature, protect the car engine, and extend the service life of the car. 2. Tank Cover can effectively prevent the evaporation of the water tank, reduce water loss, and improve the efficiency of the car cooling system. 3. Water Temperature Gauge has a variety of sizes to choose from, suitable for different models of cars, to meet the needs of different users. 4. The product material selection is high-quality, with good high temperature resistance and corrosion resistance, and high reliability. 5. Simple and convenient installation, no need to use professional tools, users can install it by themselves, saving time and effort. The water tank cover with a meter is not only to prevent water tank leakage, but also to adjust the pressure balance of the water tank and maintain the water level balance of the water tank; as the water temperature rises, the cooling water begins to expand. Once the pressure relief value is exceeded, the water tank cover spring opens, and the cooling water will flow to the water tank auxiliary water pot for storage; on the contrary, the water temperature drops, the volume of water becomes smaller, and a vacuum is formed in the water tank. At this time, the water tank cover will also open to suck the water in the auxiliary water pot back to the water tank to maintain the water level balance Package includes: 1pcs