Genuine OEM Volkswagen Radiator Coolant Hose, part number 5Q0121049BF. This hose is designed to transport coolant to and from the radiator, playing a critical role in maintaining optimal engine operating temperatures. It weighs approximately 0.397 kg and measures 0.297m in length. Choosing a genuine OEM coolant hose ensures precise routing geometry, correct material composition for heat and pressure resistance, and a leak-free connection, vital for the cooling system's integrity.