Genuine OEM Audi Activated Carbon Tank Ventilation Line, part number 8R0201991F. This critical component is responsible for routing fuel vapor from the fuel tank to the activated carbon canister, playing a vital role in the vehicle's evaporative emissions control system. It is positioned as part of the fuel tank assembly. Weighing 0.08 kg and measuring 1.12 meters in length, this line is engineered for precise fitment and vapor containment. Using a genuine OEM ventilation line ensures correct material resistance to fuel vapors, proper sealing, and accurate routing geometry for effective emissions control and system integrity.