Genuine OEM Audi Evaporative Emissions System Vacuum Hose, part number 8R0253760K. This hose is designed to carry fuel vapor from the fuel tank to the evaporative emissions control system, preventing harmful emissions from escaping into the atmosphere. It is typically located in the rear section of the vehicle, connecting various components of the EVAP system. Choosing a genuine OEM hose ensures the correct routing geometry, material composition, and resistance to fuel vapors, preventing leaks and maintaining system integrity for optimal emissions performance.