Genuine OEM Audi Engine Coolant Hose, part number 4M0121449EC. This hose is a vital component in the engine cooling system, responsible for transporting coolant to maintain optimal engine operating temperatures. It is a relatively short, curved hose, weighing approximately 0.034 kg. Using a genuine OEM hose ensures the correct material properties for resistance to heat and coolant chemicals, along with precise routing geometry for a leak-free and durable connection.