GM Genuine Parts GT174 (10164142) Fuel Tank Filler Cap;

The ACDelco GM Original Equipment Regular Fuel Cap is a threaded cap that seals your vehicle's fuel tank filler, and is a GM-recommended replacement for your vehicle’s original component. The fuel cap has a rubber gasket that provides a liquid-tight seal to keep fuel in and water and dirt out. The cap may have a check-valve that lets air in or out depending on the air pressure inside the tank. This original equipment regular fuel cap has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.