Genuine OEM Audi Engine Crankcase Vent Valve, part number 028129101E. This valve is a crucial component of the engine's crankcase ventilation system, responsible for regulating pressure and ensuring proper gas flow. It helps prevent oil leaks and maintains engine efficiency by managing crankcase gases. Weighing 0.068 kg, this valve is typically made from durable plastic and rubber. Using a genuine OEM valve ensures correct pressure regulation, prevents engine damage, and maintains optimal emissions performance.