Genuine OEM Audi Coolant Hose with Coupling, part number 5N0122157AL. This hose is designed to connect various components within the engine's cooling system, facilitating the flow of coolant to maintain optimal engine temperature. It features a coupling for secure and efficient connection. Using a genuine OEM coolant hose ensures precise fitment, proper fluid resistance, and long-term durability, preventing leaks and maintaining cooling system integrity.