Genuine OEM Volkswagen Engine Thermostat Gasket, part number 05L121139B. This gasket creates a critical seal for the thermostat housing, preventing coolant leaks and maintaining optimal engine operating temperature. It is positioned within the engine cooling system, sealing components of the thermostat assembly. Weighing approximately 0.0042 kg, it measures 0.12m in length. Genuine OEM gaskets ensure precise fitment and material composition, crucial for maintaining leak-free performance and system integrity under varying thermal conditions.