Genuine OEM Volkswagen Coolant Hose, part number 3Q0121049AP. This hose is designed to transport engine coolant between components of the cooling system, such as the radiator and engine block, to regulate engine temperature. It is an integral part of the engine's thermal management. Weighing 0.431 kg and measuring 0.44m in length, this hose is engineered for precise fitment and durability. Using a genuine OEM coolant hose ensures correct routing, material compatibility, and resistance to temperature and pressure fluctuations, preventing leaks and maintaining cooling system integrity.