The Exhaust Gas Recirculation (EGR) valve assembly (377-6955) controls the flow of exhaust gas being recirculated into the engine intake. Cat valves are manufactured to precise specifications and are built for durability, reliability, and productivity.Attributes:• EGR valve assembly for NOx reduction systemApplication:Valve for use in exhaust gas recirculation system across Cat lines. Consult your owner's manual or contact your local Cat Dealer for more information.