Genuine OEM Volkswagen AC Refrigerant Line, part number 5WA816721F. This hose is an integral part of the vehicle's air conditioning system, responsible for transporting refrigerant between components, including the AC compressor. It is designed to withstand high pressures and temperatures while preventing leaks. Genuine OEM lines ensure correct routing geometry, material compatibility with refrigerants, and durable seals, which are critical for maintaining AC system performance and preventing costly leaks.