Make repairs with the Dorman 911-003 Air Inject Check Valve. It is directly compatible with a range of vehicles. The air injection check valve has a durable metal construction to withstand extreme temperatures. It allows air into the exhaust system to help burn pollutants before they reach the atmosphere. This air check valve is compatible with a variety of Buick, Chevrolet and GMC vehicles. Since 1918, Dorman Products has supplied the automotive aftermarket with high-quality replacement parts, hardware and fasteners.