Genuine OEM Volkswagen Additional Coolant Radiator Air Duct, part number 5G0121283BB. This component is specifically designed to channel airflow efficiently to the vehicle's additional coolant radiator, supporting optimal engine temperature regulation. It is installed on the left side of the engine bay. Made from durable black plastic, it measures approximately 0.525 meters in length. Using a genuine OEM air duct ensures precise fitment and proper airflow characteristics, critical for maintaining the intended cooling system performance.