Genuine OEM Audi A/C Refrigerant Line, part number 4M0816721AQ. This essential component is responsible for carrying refrigerant between the A/C compressor and the condenser, playing a vital role in the vehicle's air conditioning and cooling cycle. It is positioned in the engine bay, connecting key components of the A/C system. Weighing 0.324 kg and measuring 0.705 m in length, this line is engineered for specific routing and connection points. Choosing a genuine OEM refrigerant line ensures proper pressure handling, leak-proof seals, and resistance to chemical degradation, which are critical for the longevity and efficiency of the entire A/C system.