Genuine OEM Audi Reducing Agent Filler Line, part number 4N0131963C. This line is responsible for safely transferring the reducing agent (such as AdBlue or Diesel Exhaust Fluid) from the filler neck into the vehicle's dedicated storage tank. It is an integral component of the Selective Catalytic Reduction (SCR) system, ensuring proper emissions control. Weighing 0.922 kg and measuring 0.64 meters in length, this genuine OEM line is engineered for precise fitment and chemical resistance, guaranteeing leak-free operation and system integrity.