Genuine OEM Volkswagen Thermostat Housing Pipe Union, part number 045121121A. This component serves as a critical connection point, linking various cooling system pipes to the thermostat housing. It ensures the proper routing and sealing of coolant within the engine's thermal management system. Weighing 0.068 kg, this plastic union is designed for durability. Using a genuine OEM pipe union guarantees precise fitment, resistance to coolant chemicals and temperature fluctuations, and a leak-free connection vital for maintaining engine cooling efficiency.