This is a metal crankcase ventilation (VKG/PCV) valve for BMW N54 engines, sold as an individual replacement part rather than as part of a full valve cover assembly. It is made from durable, wear-resistant material and regulates crankcase gas flow; replacing just the failed valve avoids the cost of a complete valve cover replacement when only this component has worn out, a common cause of rough idle and oil leaks on N54 engines.

Fitment: BMW 1 Series, 3 Series, 5 Series and Z4 with the N54B30 engine, covering the E82, E90, E92, E60 and E89 chassis.