Description: Ensure your vehicle's cooling system operates efficiently with the 15 P.S.I. Radiator Surge Tank Cap, GM part number 15075118. This cap is designed to seal and regulate cooling pressure within the radiator surge tank, which is essential for maintaining optimal engine performance. By effectively managing the pressure, this cap helps to prevent leaks and ensures the proper circulation of coolant throughout the system. Trust this GM Genuine Part to help maintain your engine's cooling efficiency.