Genuine OEM Audi Reducing Agent Transfer Line, part number 4N0131961A. This line is responsible for transferring the reducing agent (such as AdBlue/DEF) to various points within the vehicle's emissions control system. It plays a vital role in the selective catalytic reduction (SCR) process. Weighing 0.302 kg, this line is engineered to withstand the specific chemical properties of the reducing agent and maintain system integrity, preventing leaks and ensuring proper emissions reduction.