This engine coolant thermostat with gasket is a reliable and durable choice for your vehicle. It is designed to fit GM engines with ease, and comes with all the necessary items included for installation. The thermostat is made of metal and copper materials, and has been tested for durability and leaks. With a vintage part number of ACDelco 131-120, this thermostat is a great fit for your classic car or truck. It has a high opening temperature of 195 °F, and is compatible with various GM engines. The mounting style is insert, and there are no drilling or modifications needed for installation. Buy with confidence, and enjoy the peace of mind that comes with a reliable engine coolant thermostat.