Genuine OEM Volkswagen Refrigerant Line, part number 3WA816721. This line is responsible for transporting refrigerant between different components of the vehicle's air conditioning system. It is located at position 5 in the provided diagram. The weight of this line is 0.196 kg. Genuine OEM refrigerant lines are essential for the A/C system to ensure correct refrigerant flow, withstand system pressures, and prevent leaks.