Genuine OEM Volkswagen vacuum tube with non-return valve, part number 4B0611931BR. This part functions as a conduit within the vehicle's vacuum system, featuring a non-return valve to control the direction of air flow. It is essential for maintaining proper vacuum pressure for various systems. The non-return valve ensures that vacuum is held or directed correctly. Genuine OEM parts guarantee the precise specifications and reliable operation required for the vacuum system's integrity.