Genuine OEM Audi Vent Hose, part number 3QF201311. This hose allows for the passage of air or vapors within the fuel system, typically as part of the evaporative emissions control (EVAP) system. It is designed to withstand fuel vapors and temperature fluctuations. The hose ensures a secure and leak-free connection to prevent emissions and maintain system integrity. Genuine OEM hoses are made with specific materials and dimensions for reliable operation.