This product is a genuine VW / Audi engine coolant thermostat gasket with the part number 06B121119C. It is used to seal the connection between the thermostat housing and the engine block, ensuring proper circulation of coolant and maintaining the engine's temperature. This gasket is made from high-quality materials and is designed specifically for VW and Audi vehicles. It is an essential component for proper engine function and should be replaced if worn or damaged.