Genuine OEM Audi Evaporative Emission Line, part number 4G0201997AF. This rigid pipe is an essential component of the vehicle's evaporative emissions system, responsible for safely routing fuel vapors from the fuel tank to the charcoal canister. It ensures proper containment and processing of fuel vapors, preventing their release into the atmosphere. Genuine OEM emission lines are engineered for precise fitment and material compatibility, ensuring a leak-free connection and long-term resistance to fuel and environmental factors, which is critical for emissions compliance.