Genuine OEM Audi Coolant Hose With Coupling, part number 4H0121056M. This hose connects various cooling system components, facilitating coolant flow and allowing for easy disconnection during maintenance. It is located within the engine cooling system, often near the radiator. Weighing 0.251 kg and measuring 0.425 m in length, this hose is designed for precise routing and features materials resistant to high temperatures and pressures, crucial for maintaining engine thermal stability.