Genuine OEM Volkswagen Pipe Union, part number 03L121121A. This component serves as a connection point for various coolant hoses and components within the engine's cooling system. It is typically located in the engine bay, facilitating the flow of coolant. Manufactured from durable plastic, this part ensures reliable operation of the cooling system. Genuine OEM parts are essential for maintaining the precise fit and function required for the cooling system's integrity and longevity.