Genuine OEM Audi Breather Line, part number 3D0201160S. This component plays a vital role in the fuel system by allowing the fuel tank to vent, preventing pressure buildup or vacuum formation as fuel levels change and temperatures fluctuate. It is integrated into the fuel tank assembly. With a length of approximately 0.85 meters, this line is designed for precise routing. Choosing a genuine OEM breather line ensures the correct material and diameter for optimal vapor flow and resistance to fuel degradation, preventing issues like fuel starvation or tank deformation.