Genuine OEM Audi Cooling System Connection Flange, part number 03H121145A. This plastic flange is a crucial component within the engine cooling system, designed to connect various hoses or pipes and ensure a leak-free transfer of coolant. Made from high-grade, heat-resistant plastic, it maintains integrity under varying temperatures and pressures. Using a genuine OEM connection flange guarantees precise fitment and material compatibility, which are essential for preventing coolant leaks and maintaining the engine's optimal operating temperature.