Genuine OEM Audi Breather Line, part number 8W0121081BK. This line is designed to provide essential ventilation for various engine components, helping to regulate internal pressures and prevent the buildup of harmful gases. It measures approximately 8.3 cm long. Choosing a genuine OEM breather line ensures the correct material composition and precise routing geometry, which is crucial for maintaining engine health, preventing oil leaks, and ensuring optimal performance of the crankcase ventilation system.