Genuine OEM Volkswagen Coolant Pipe Union, part number 7P0121065AC. This component connects two or more coolant pipes or hoses within the engine's cooling system. It is located at position 21 in the diagram. The part has dimensions of 0.255m x 0.08m x 0.04m and weighs 0.14 kg. Genuine OEM coolant pipes ensure exact fitment and material integrity, crucial for preventing leaks and maintaining optimal engine temperature.