Genuine OEM Audi Flexible Coolant Hose, part number 4F0145926A. This flexible hose is a key part of the engine's cooling system, responsible for circulating coolant. It connects various components to ensure efficient heat transfer and maintain the engine's optimal operating temperature. Genuine OEM hoses are made with specific rubber compounds and reinforcement to resist heat, pressure, and degradation, ensuring long-term reliability and preventing leaks.