Genuine OEM Audi Coolant Hose, part number 4E0121130R. This flexible hose is a crucial part of the engine cooling system, designed to transfer coolant between various engine components, particularly in the vicinity of the alternator and water pump. It plays a key role in maintaining optimal engine operating temperatures. Weighing approximately 0.135 kg and measuring 0.315 m in length, this hose features a specific curved geometry for exact routing. Opting for a genuine OEM coolant hose ensures the correct material composition, flexibility, and resistance to high temperatures and pressures, which are essential for preventing leaks and ensuring long-term cooling system reliability.