Prepare your semi truck to be Ready for the Road Ahead™, with the Dorman Heavy Duty Exhaust Gas Recirculation Valve that helps reduce nitrogen oxide emissions from an engine. Due to its technical design, this replacement piece is able to help lower an engine's combustion temperature and nitrogen oxide output by recirculating a portion of the exhaust gas back into the combustion chamber. Crafted with an ultra-durable construction to maintain the best quality possible. FleetPride is your First Click in Heavy Duty®.