Genuine OEM Audi Engine Coolant Hose, part number 4M0121449EB. This hose is a vital component of the engine cooling system, responsible for carrying coolant to regulate engine temperature. It is designed to withstand high temperatures and pressures within the cooling circuit. The hose measures approximately 17 cm in length and weighs 0.0569 kg. Using a genuine OEM coolant hose ensures the correct routing geometry, material composition, and resistance to thermal cycling, preventing leaks and maintaining optimal engine operating temperatures.