Description: The Porsche Engine Crankcase Vent Valve 996-107-026-52 is the factory PCV valve for the 911 (996) and Boxster engines. It regulates crankcase pressure by venting combustion blow-by gases back into the intake. A failed valve causes oil consumption, rough idle, and positive crankcase pressure. Porsche-built to the original flow specifications ; a dependable fix for PCV-related symptoms.