Genuine OEM Audi Coolant Hose, part number 4S0122109. This flexible hose is an essential component of the engine cooling system, responsible for transferring coolant between various engine components to regulate operating temperature. It is designed to withstand high temperatures and pressures within the cooling circuit. This hose measures approximately 0.485 meters in length and weighs about 0.732 kg. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition for heat and chemical resistance, and proper fitment to prevent leaks and maintain the efficiency of the engine's cooling system.