Pickle-Pro Fermenting Lid - Wide Mouth

A friend in SD has been making home-made kimchi and it's delicious. She said that she uses an airlock device on her canning jars. This must be like what she uses. I'd love to try one of these and get started on home-made sauerkraut. It has been my intention for about a year, but I never get around to getting this little helper! Wardeh says that this one works great!