Genuine OEM Volkswagen A/C Expansion Valve Seal, part number 1K0820139A. This seal is specifically designed to prevent refrigerant leaks from the A/C expansion valve, maintaining the integrity and efficiency of the air conditioning system. Made from a durable elastomer, it weighs approximately 0.012 kg. Choosing a genuine OEM seal ensures the correct material composition, dimensions, and sealing properties, which are critical for preventing costly refrigerant loss and ensuring reliable A/C operation.