Prepare your semi truck to be Ready for the Road Ahead , with the Dorman Heavy Duty Exhaust Gas Recirculation Valve that provides improved engine efficiency and performance. Due to its sophisticated design, this replacement valve is able to reduce nitrogen oxide levels by recirculating a percentage of an engine's exhaust gases back into the intake manifold. Engineered with high-quality components to minimize the need for cleaning. FleetPride is your First Click in Heavy Duty .