The Little Fermenter unlocks simple, small-batch fermentation. This kit transforms a regular-mouth mason jar into a fermentation vessel, complete with a stainless steel airlock that vents gas while preventing air and contaminants from entering. A stainless steel spring ensures vegetables stay submerged in the brine, promoting proper fermentation and preventing spoilage. Enjoy homemade sauerkraut, pickles, and more with ease using this compact and reliable system.