Genuine OEM Audi Supply Line for Reduction Agent, part number 5Q0131983J. This specialized line is responsible for transporting the reduction agent (such as AdBlue) to various components within the vehicle's selective catalytic reduction (SCR) emissions system. Its robust construction and material composition are designed to withstand the specific properties of the reduction agent and prevent leaks. Weighing 0.318 kg and approximately 0.33 m long, using a genuine OEM line ensures proper routing, secure connections, and the long-term reliability of the emissions control system.