Genuine OEM Audi Thermostat Housing Plug, part number 06B103033A. This plug is specifically designed to seal an opening in the thermostat housing, preventing coolant loss and maintaining the integrity of the engine's cooling system. It appears to be constructed from durable plastic or rubber with a metal insert. Weighing 0.022 kg, this genuine OEM plug ensures a precise fit and robust seal, critical for preventing coolant leaks and maintaining optimal engine temperature regulation.