Universal Medium Head Thermostatic Water Tank Cap Cover with Pressure and Temperature Gauge FG05 Features: 1. Constructed from high-quality aluminum alloy and ABS material for durability and long service life. 2. Thermostatic cap with integrated water temperature gauge allows accurate monitoring of coolant temperature without starting the engine. 3. Enhances heat resistance and improves the sealing performance of the radiator cap. 4. Provides precise coolant temperature readings for better engine temperature management. 5. Easy bolt-on installation; simply remove the old cap and install the new one. Specifications: Condition: Item Type: Thermostatic Cap Material: Aluminum Alloy + ABS Quantity: 1 Piece Color: As Shown in Picture Function: 1. Prevents coolant leakage and helps regulate radiator system pressure to maintain optimal coolant levels. 2. As coolant temperature increases, the cooling system expands; when pressure exceeds the relief value, the cap’s internal spring opens to release excess coolant into the overflow reservoir. 3. When temperature decreases, coolant volume contracts, creating a vacuum in the system. 4. The cap then opens to draw coolant back from the reservoir into the radiator, maintaining balanced fluid levels. Advantage: Replacing the standard radiator cap with this thermostatic model enables real-time monitoring of coolant temperature, improving vehicle performance and preventing overheating. Package List: 1 x Thermostatic Cap