Genuine OEM Volkswagen A/C Refrigerant Adapter, part number 3WA816517. This adapter is designed to connect various components within the vehicle's air conditioning refrigerant circuit. It is located at position 61 in the provided diagram. The weight of this adapter is 0.221 kg. Genuine OEM adapters are critical for the A/C system to ensure proper sealing, prevent refrigerant leaks, and maintain optimal system performance.