Before these lids, we were using Ball plastic lids with a hole, a silicone grommet to hold the airlock, and a silicone sealing ring to make them airtight. Eventually the plastic would crack or break, and it was fussy to assemble all the pieces. This single piece of silicone replaces the lid, grommet, and sealing ring! They are easier to use, easier to clean, way better looking, and double as a tumbler lid when you aren't fermenting anything!
For a complete lacto fermentation setup, pair this lid with an airlock and a glass weight. This will lower the chances of mold on your ferment. More fermentation instructions are coming soon, but for now they are widely available on blogs and other websites.
These will fit on any wide mouth jar - half pint (8oz), pint (16oz), pint & half (24oz), quart (32oz), and half gallon (64oz).