Genuine OEM Audi Breather Vent Hose, part number 03C103474AD. This critical component allows crankcase gases to escape, preventing pressure buildup within the engine and ensuring proper ventilation. It is typically located as part of the PCV (Positive Crankcase Ventilation) system, connecting various engine components. This hose weighs 0.15 kg and measures 0.38 m in length. Using a genuine OEM hose guarantees the correct routing geometry, material resistance to oil and heat, and a secure fit, preventing leaks and maintaining engine efficiency.