Genuine OEM Audi Fuel Tank Ventilation Line, part number 8R0201991T. This flexible line is an integral part of the fuel system, responsible for routing fuel vapors from the fuel tank to the evaporative emissions system. It is positioned at the rear of the vehicle, connecting directly to the fuel tank and associated components. Constructed from specialized fuel-resistant materials, it ensures safe and efficient vapor transfer. Choosing a genuine OEM ventilation line guarantees the correct material composition, precise routing geometry, and secure connections for optimal emissions control and fuel system reliability.