Genuine OEM Audi Breather Vent Hose, part number 03F103560B. This hose is an integral part of the engine's crankcase ventilation system, allowing harmful gases and vapours to escape the crankcase. Proper ventilation prevents pressure buildup and helps maintain engine cleanliness and efficiency. The hose features a specific S-shape for correct routing. Using a genuine OEM breather hose ensures resistance to oil and heat, preventing cracks and leaks that can lead to vacuum issues or oil consumption.