Genuine OEM Volkswagen Radiator Coolant Hose, part number 3C0121049J. This hose is responsible for transferring coolant between the engine and the radiator, playing a vital role in regulating engine temperature and preventing overheating. It is an integral part of the engine cooling system. Weighing 0.614 kg, this genuine OEM hose ensures correct routing geometry and resistance to extreme temperatures and pressures, preventing leaks and maintaining efficient cooling system operation.