Genuine OEM Volkswagen Coolant Hose with Coupling, part number 1K0122157JJ. This hose is a vital component of the engine cooling system, responsible for transporting hot and cold coolant between various engine components, such as the radiator, engine block, and heater core. It is positioned within the engine bay as part of the coolant circuit. Weighing approximately 0.18 kg, this hose is constructed from high-quality, heat-resistant rubber compounds designed to withstand extreme temperatures and pressures. Using a genuine OEM coolant hose ensures correct routing, proper diameter, and durable couplings, preventing leaks and maintaining the efficiency and longevity of the engine's cooling system.