Genuine OEM Audi Radiator Lower Coolant Hose, part number 8R0121109J. This essential hose is responsible for carrying coolant fluid to and from the radiator, playing a critical role in the engine's thermal management system. It is specifically positioned as a lower hose, connecting the engine to the radiator. Constructed from durable EPDM rubber, it measures approximately 0.315 meters in length and features factory-fitted quick connectors. Opting for a genuine OEM radiator hose ensures precise fitment, correct material specifications for heat and pressure resistance, and optimal routing, preventing leaks and maintaining cooling system integrity.