Genuine OEM Audi Coolant Hose With Coupling, part number 4L0121447. This hose is responsible for transporting coolant throughout the engine system, playing a critical role in temperature regulation. It is specified for the left side of the assembly. The hose is constructed from reinforced rubber and features a coupling for secure connection. Genuine OEM coolant hoses are engineered to withstand high temperatures and pressures, ensuring reliable engine cooling and preventing leaks.