Genuine OEM Audi Coolant Hose, part number 1K0122157AG. This essential hose is responsible for transporting engine coolant, playing a critical role in maintaining optimal engine operating temperature. It is typically found within the engine cooling system, connecting various components like the radiator or heater core. The hose features a quick-release connection for easier installation and removal. Using genuine OEM coolant hoses ensures the correct routing geometry, material composition, and pressure resistance for reliable, leak-free performance under varying engine conditions.