Genuine OEM Audi Headlight Housing De-Airing Hose, part number 4N0941717. This hose is responsible for removing air from the headlight housing, preventing pressure buildup and ensuring proper sealing. It is installed on the left side of the vehicle. Constructed from high-quality, resilient material, it withstands temperature fluctuations. Genuine OEM hoses provide precise fitment and material integrity, vital for maintaining headlight longevity and optical clarity.