Genuine OEM Volkswagen Engine Coolant Hose, part number 4M0121056AB. This flexible hose is a vital part of the engine cooling system, responsible for circulating coolant between various components like the engine, radiator, and heater core. It ensures efficient heat transfer to maintain optimal engine operating temperatures. Weighing 0.099 kg and measuring 0.295 m in length, this hose is constructed from durable, heat-resistant materials. Using a genuine OEM coolant hose guarantees correct routing geometry, material composition, and resistance to thermal cycling and coolant chemicals, preventing leaks and maintaining cooling system integrity.