EGR (Exhaust Gas Recirculation) valves recirculate a portion of the exhaust gas from the engine (5 to 15) back into the combustion process. This ensures that the fuel gets completely burned while decreasing the production of harmful gases such as nitrous oxide. br br Shop Best Quality Dorman EGR Valve & Parts :: br br br Shop High Quality Egr Valves in Finest Prices :: br br br Shop Egr Lines at PartsAvatar.