Genuine OEM Audi Engine Coolant Pipe, part number 4M0121485BA. This multi-branched pipe assembly is an integral part of the engine cooling system, responsible for circulating coolant to regulate engine temperature. It connects to the expansion tank and other cooling components, ensuring efficient heat transfer. The pipe weighs 0.258 kg and measures approximately 0.32 meters in length. Opting for a genuine OEM coolant pipe guarantees the correct material composition, precise routing, and leak-free connections, which are vital for preventing overheating and maintaining engine longevity.