Genuine OEM Audi Evaporative Emission Breather Line, part number 4G0201997AK. This line manages evaporative emissions from the fuel system, directing fuel vapors to the charcoal canister for processing and preventing their release into the atmosphere. It is shown as item 5 in the diagram, connecting components around the fuel tank assembly. Weighing 0.109 kg, this line is designed for specific routing and material resistance. Choosing a genuine OEM line ensures correct routing geometry, material integrity, and resistance to fuel vapors, maintaining emissions compliance and system functionality.