Genuine OEM Volkswagen Vacuum Tube, part number 059131051DF. This vacuum tube is a component of the emissions control system, responsible for regulating vacuum pressure to various actuators. It is marked as number 13 in the diagram. Constructed from durable rubber and plastic, it ensures reliable operation and precise control. Genuine OEM parts are crucial for the emissions system to maintain correct calibration and prevent leaks, ensuring compliance with environmental standards.