Genuine OEM Audi Coolant Flange, part number 038121133A. This essential component connects various coolant hoses and precisely directs the flow of coolant throughout the engine cooling system. It is typically located on the engine block or cylinder head. Constructed from durable metal, it is designed to withstand high temperatures and pressures. Using a genuine OEM coolant flange ensures a leak-free seal and proper coolant routing, critical for maintaining optimal engine operating temperatures and preventing overheating.