Genuine OEM Audi Engine Coolant Hose, part number 03H121049A. This hose is a vital component in the engine cooling system, responsible for transporting hot and cold coolant between the engine, radiator, and other cooling components. Weighing 0.18 kg, it is designed to withstand high temperatures and pressures. Using a genuine OEM coolant hose ensures the correct material composition, precise routing, and robust connections, preventing leaks and maintaining efficient engine temperature regulation.