Closed drain cover for Bathroom Paul de Groot

This is a closed lid for a drain cover to reduce smell when the drain is not used frequently (spare bathroom). Diameter = 97 mm height = 4 mm. The inner disc is for support in case someone stands on the lid. The disc locks into a bajonet fitting. Photo is taken from the bottom. The top is flat with a small indent to allow the user to rotate the lid into a closed position.