Genuine OEM Volkswagen Reduction Agent Supply Line, part number 561131984A. This line transports the reduction agent from the tank to the injection point within the exhaust system, playing a crucial role in selective catalytic reduction (SCR) systems for reducing NOx emissions. It is positioned as part 20 in the diagram. This part weighs 0.371 kg and has dimensions of 0.415m x 0.3m x 0.06m. Genuine OEM lines are designed for precise routing and resistance to the specific fluid and operating conditions.