Ball Jar Wide Mouth Fermentation airlock

thingiverse

This is a simple fermentation lid for wide mouth ball jars. You will still need the ball jar rings. For a better seal, you can add a rubber o-ring or foodgrade silicone between the jar and the lid. Just add water and place the cap. Make sure water level is always filled halfway. You can also use nail polish and paint the cap to know when the water level is too low.