Genuine OEM Volkswagen SCR Reduction Agent Filler Pipe, part number 4M4131963B. This pipe is a crucial component for safely and cleanly refilling the Selective Catalytic Reduction (SCR) agent, also known as Diesel Exhaust Fluid (DEF), into its dedicated tank. Weighing 0.278 kg, this genuine OEM filler pipe ensures a leak-free connection and proper flow, which is vital for the correct operation of the vehicle's emissions control system.