Genuine OEM Audi Coolant Hose, part number 4E0121445T. This hose is a critical component in the engine cooling system, responsible for transferring coolant between various engine components to maintain optimal operating temperatures. It is a curved hose, measuring 215mm in length and weighing 0.131 kg. Genuine OEM coolant hoses are constructed from high-grade rubber compounds designed to withstand extreme temperatures and pressures, ensuring leak-free connections, correct routing, and long-term integrity of the cooling system.