The ACDelco GM Original Equipment E85 Yellow Gas Cap and Locking Gas Cap is a threaded cap that seals your vehicle's fuel tank filler, and is a GM-recommended replacement for your vehicles 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 E85 yellow gas cap is designed for FlexFuel vehicles and provides a visual reminder that the vehicle is E85 compatible. Available in a locking and non-locking version. This original equipment E85 yellow gas cap and locking gas cap has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.