Genuine OEM Audi Vacuum Pipe with Non-Return Valve, part number 7L6611931AN. This critical component is designed to transport vacuum from the engine to the brake booster, providing essential power assist for braking. It incorporates a non-return valve to maintain vacuum pressure and prevent backflow within the system. Positioned as part of the brake vacuum system, it connects directly to the brake booster. Measuring approximately 0.75 meters in length, this pipe ensures precise fitment and reliable vacuum integrity. Using a genuine OEM part guarantees the correct material, valve calibration, and routing geometry for safe and effective braking performance.