Genuine OEM Audi Coolant Hose, part number 4E0121088K. This flexible hose is an integral part of the engine cooling system, designed to transport coolant between various components to regulate engine temperature. It ensures efficient heat transfer and prevents overheating. Weighing 0.35 kg and measuring 0.42m in length, this hose is constructed from durable, heat-resistant rubber compounds. Using a genuine OEM coolant hose guarantees the correct material composition, precise routing geometry, and resistance to pressure and temperature fluctuations, preventing leaks and ensuring long-term reliability of the cooling system.