Picklemeister Fermentation, Sauerkraut And Pickle Fermenting Jar wide Mouth Mason Jar Kit, Kimchi, Probiotics (3 Pack) Made in the USA, to fit a wide mouth mason jar, of American and foreign parts, comes with color instructions & recipes The classic air lock is still the best allowing you to watch and know when fermenting is slowing, it also allows the water to flow up and down so it never creates negative pressure inside the jar thereby altering the consistency of the vegetables. Great for making lactic acid fermented vegetables, pickles and Sauerkraut Food Grade and BPA free. Specially designed silicone seal to help prevent leaks Please note this is the kit only, it include everything you need but the jar