These are great jar-sized airlock systems for all your krauts, brined vegetables, and other anaerobic ferments. If you've picked up some second hand jars or have collected a lot of them for your other preservation needs and want to make them into fermenting jars! These are great.
They fit on any size 4 Fowlers jar - made for Jar #31
Includes
1x size 4 stainless steel lid with grommet
1x size 4 clip
1x size 4 ring
1x airlock
1x size 4 clip
1x size 4 ring
1x airlock