Genuine OEM Audi Cylinder Head Coolant Tube, part number 06C121085H. This critical component is responsible for circulating coolant directly through the cylinder head, playing a vital role in managing engine temperature and preventing overheating. The tube features multiple outlets for precise coolant distribution. Weighing approximately 0.446 kg, it is typically made from durable, heat-resistant plastic. Choosing a genuine OEM coolant tube ensures the correct internal flow dynamics and resistance to thermal cycling, which is crucial for the longevity and performance of the engine's cooling system.