Genuine OEM Audi Engine Breather Hose, part number 05A103221B. This hose allows crankcase gases to escape and be recirculated, preventing pressure buildup and ensuring proper engine ventilation. It is located on the left side of the engine. Weighing 0.098 kg and measuring 0.311 m in length, this hose is designed for resistance to oil vapors and temperature fluctuations. Using a genuine OEM hose ensures correct routing, proper sealing, and long-term durability for effective crankcase ventilation.