Genuine OEM Audi Coolant Hose with Coupling, part number 9J1121545C. This hose is designed to connect various components within the engine's coolant system, facilitating the flow of coolant. It is a precisely shaped hose, weighing approximately 0.089 kg and measuring 0.16 meters in length. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and resistance to temperature and pressure fluctuations, preventing leaks and maintaining optimal engine cooling efficiency.