An ACDelco Professional, premium aftermarket Positive Crankcase Ventilation (PCV) Valve is an emission control component and is the high quality replacement ideal for many vehicles on the road today. The PCV valve controls the volume of crankcase vapors that are drawn into the intake manifold; a restricted PCV valve can cause oil leaks or increase oil consumption. This premium aftermarket replacement PCV valve is manufactured to meet your expectations for fit, form, and function.