Genuine OEM Audi Engine Coolant Pipe, part number 4K1819377D. This pipe is a critical component in the engine cooling system, responsible for circulating coolant to regulate engine temperature. It is a rigid pipe designed for a specific routing within the engine bay. Weighing approximately 0.09 kg, this pipe measures 0.28m in length. Choosing a genuine OEM coolant pipe ensures precise fitment, correct flow characteristics, and resistance to thermal and chemical stresses, preventing leaks and maintaining cooling efficiency.