Genuine OEM Volkswagen Flange, part number 028121132A. This component is part of the engine cooling system, typically used to connect coolant hoses to the engine block or thermostat housing, enabling the circulation of coolant. It often includes a sealing surface for a leak-free connection. Made from durable plastic or metal. Genuine OEM flanges are manufactured to exact specifications to ensure a secure, leak-free fit and proper coolant flow, maintaining optimal engine operating temperature.