Genuine OEM Audi Coolant Hose With Coupling, part number 4K0819350K. This multi-branched hose is designed to connect various cooling system components, facilitating the transfer of coolant to maintain optimal operating temperatures. Its complex, molded shape ensures precise routing and secure connections within the engine bay or HVAC system. Choosing a genuine OEM coolant hose ensures correct fitment, material integrity, and resistance to temperature and pressure fluctuations for long-term reliability.