The ACDelco Professional, premium aftermarket Exhaust Gas Recirculation (EGR) Valve is an emission control device, and is the high quality replacement ideal for many vehicles on the road today. The EGR valve modulates the flow of exhaust gas into the intake manifold to reduce nitrogen oxide (NOx) emissions. This premium aftermarket replacement exhaust gas recirculation valve is manufactured to meet your expectations for fit, form, and function.