Genuine OEM Audi Reduction Agent Supply Line, part number 2H6131963F. This specialized line is responsible for safely transporting the reduction agent, such as AdBlue or DEF, from its reservoir to the vehicle's selective catalytic reduction (SCR) emissions system. It plays a vital role in reducing harmful nitrogen oxide emissions. Weighing approximately 0.35 kg, this line is engineered for specific fluid compatibility and pressure. Choosing a genuine OEM supply line ensures correct material composition for chemical resistance, precise routing geometry, and leak-free connections, which are critical for the proper functioning and longevity of the emissions control system.