Genuine OEM Volkswagen Breather Line, part number 5C0201160J. This line facilitates the controlled release of vapors from the fuel tank, playing a role in emissions control and maintaining proper system pressure. It connects to the fuel tank and other components within the evaporative emission control system. The precise dimensions and material composition ensure proper vapor flow and prevent leaks. Genuine OEM parts are vital for the correct calibration and function of the emissions system.