Genuine OEM Audi Engine Coolant Hose, part number 4L0121051A. This flexible hose is an integral part of the engine cooling system, designed to transport coolant between various engine components. It ensures efficient heat transfer and helps maintain the engine's optimal operating temperature. This coolant hose weighs approximately 0.111 kg. Choosing a genuine OEM coolant hose guarantees the correct material composition for heat and pressure resistance, precise routing geometry, and long-term flexibility to prevent leaks.