Genuine OEM Volkswagen Coolant Hose, part number 2E0121157B. This specialized hose is designed to transport coolant to the heat exchanger of the auxiliary heater, ensuring efficient operation of the vehicle's heating system. It is an integral part of the engine cooling and climate control systems. Measuring 0.43 meters in length, this genuine OEM hose provides precise routing and resistance to high temperatures and pressures, critical for maintaining optimal engine temperature and cabin comfort.