Genuine OEM Audi Radiator Lower Coolant Hose, part number 4F0121055R. This hose connects the radiator to the engine cooling system, facilitating coolant flow. It is positioned at the lower connection point of the radiator. Weighing 0.3358 kg, a genuine OEM hose ensures correct routing geometry, material resistance to heat and coolant, and secure, leak-proof connections for reliable engine temperature regulation.