Genuine OEM Audi Crankcase Ventilation Valve, part number 030103175B. This critical valve is responsible for regulating pressure and managing harmful fumes within the engine's crankcase, contributing to efficient engine operation and emissions control. It is typically integrated into the PCV (Positive Crankcase Ventilation) system. Weighing 0.0115 kg, this small, black plastic valve is designed for durability. Using a genuine OEM valve ensures precise calibration and material integrity, which are essential for maintaining proper engine vacuum and preventing oil leaks or excessive emissions.