Genuine OEM Volkswagen Engine Coolant Hose, part number 03N121057B. This hose is a vital part of the engine cooling system, responsible for carrying coolant between various engine components to maintain proper operating temperatures. It measures approximately 0.11 meters in length. Using a genuine OEM coolant hose ensures correct routing, material durability, and resistance to high temperatures and pressures, preventing leaks and maintaining cooling system integrity.