Genuine OEM Audi AdBlue Fluid Line, part number 4M0131961B. This line is a critical component of the Selective Catalytic Reduction (SCR) system, responsible for transporting AdBlue (Diesel Exhaust Fluid) to the exhaust system. It is typically routed from the AdBlue tank and pump assembly towards the front of the vehicle, connecting to the injector. Weighing approximately 0.219 kg and measuring 0.35 meters in length, it is designed for precise routing and fluid compatibility. Using a genuine OEM AdBlue fluid line ensures proper sealing, resistance to corrosive DEF fluid, and accurate delivery, which is vital for maintaining emissions compliance and system reliability.