Genuine OEM Jaguar Coolant Tank Reservoir Cap, part number C2P20325. This cap is designed to securely seal the coolant reservoir tank, preventing leaks and maintaining the integrity of the cooling system. It is installed on the coolant expansion tank, regulating system pressure. The cap is engineered to maintain a precise pressure of 200 kPa within the cooling system. A genuine OEM cap ensures the correct pressure relief and sealing characteristics, vital for preventing overheating and maintaining optimal engine cooling.