Genuine OEM Audi Activated Charcoal Container Air Line, part number 4K0201997K. This rigid line is a key component of the evaporative emissions system, responsible for carrying air and fuel vapors to or from the activated charcoal canister. It ensures the proper function of the emissions control system by managing fuel vapor flow. Genuine OEM lines are designed for precise routing and connection points, made from durable materials that resist fuel and environmental degradation, ensuring long-term emissions compliance and system integrity.