Genuine OEM Volkswagen Rear Reduction Agent Supply Line, part number 5WA131983F. This line is responsible for delivering reduction agent (such as AdBlue/DEF) to the exhaust system, playing a critical role in reducing harmful emissions. It is positioned in the rear section of the vehicle. Weighing approximately 0.268 kg and measuring 0.33 meters in length, this line ensures precise delivery. Genuine OEM supply lines provide the correct material resistance to the reduction agent and precise routing for effective and compliant emissions control.