Lekue Silicone 7-Inch Suction Lid
Silicone suction lids fit multiple sizes and materials ( pots, pans, bowls and servers in metal, ceramic and glass).  Helps to preserve food in the fridge and freezer.  Also great as a splatter screen in the oven and microwave.  Freezer, oven, microwave and dishwasher safe. To use, place lid (using the handle) on whatever you are sealing and press slightly for better closure.  When heating suction releases to vent; lid reseals when contents cool down.  To remove, lift slightly from edge.