Genuine OEM Audi Coolant Hose, part number 4F0265374E. This hose is responsible for carrying coolant between various engine components, ensuring efficient heat transfer and maintaining the engine's operating temperature. It is a shaped hose, connecting to a control valve within the cooling circuit. Constructed from high-quality, flexible rubber, it is designed to withstand high temperatures and pressures. Using a genuine OEM hose guarantees the correct internal diameter, routing geometry, and material composition for optimal flow and long-term durability, preventing leaks and maintaining system integrity.