Genuine OEM Audi Coolant Hose, part number 4G0122101F. This flexible hose is a critical component in the engine cooling system, designed to transport coolant between various parts. It is located on the left side of the cooling system, connecting to the radiator. Featuring an integrated coupling for a secure connection, genuine OEM hoses ensure correct routing geometry and resistance to high temperatures and fluid degradation, which is essential for preventing leaks and maintaining system pressure.