Mason Jar Fermentation

Good for the Gut

Take the guesswork out of home fermentation. This mason jar fermenting lid creates the perfect anaerobic environment to make sauerkraut, pickles, kimchi, and other ferments.

There’s less daily maintenance, too, compared to other techniques. The lid keeps air out but is designed to let gases escape, so you don’t have to burp it
every day. Plus, mason jars are pretty easy to get a hold of—you can even use ones you already own. Just screw the airlock lid onto jar and wait for the good bacteria to emerge.

Fermentation is good for you because of that bacteria. It can boost your gut health, strengthen your immunity, and improve your body's ability to absorb nutrients.

Whether you’re experienced or new to the craft, Masontops’ kit equips you with everything you need (instructions, recipes, glass weights, and even a vegetable tamper to help release release the veggie’s brine directly in the jar).

Make room on your counter for your very own batches of fermented goodness. Your gut will thank you.
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As low key as home fermentation gets.

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Grommet Launch Conversation

  • Mike

    Hello everyone! I’m Mike Bacher, co-founder of Masontops. We’re thrilled to be featured as today’s Grommet. Masontops are easy-to-use tools to ferment your own vegetables in Mason jars, like sauerkraut, pickles and kimchi. We want everyone to be able to make their own fermented superfoods at home and benefit from the probiotic goodness they offer. At Masontops, we make it more than a mason jar.

  • LaNell
    8/14/2017 11:44 AM

    What is the largest size mason jar that can be used with the Masontops?

  • Mike
    Mike – Special Guest
    8/14/2017 12:00 PM


  • Mike
    Mike – Special Guest
    8/14/2017 12:03 PM

    @Lanell, we offer tools to fit both Regular Mouth and Wide Mouth Mason jars. The "Complete Mason Jar Fermentation Kit" which includes all 3 tools is only available for Wide Mouth.

    Any size Mason jar by a common brand (like Ball or Kerr) will either have a "Wide" or "Regular" mouth size, and the corresponding Masontops product will fit it. Our favorite would be the Quart sized Wide Mouth jar as it perfectly fits one head of cabbage for a great batch of sauerkraut! Please let us know if you have any more questions!

  • Fran
    8/14/2017 11:51 AM

    Kombacha, wine vinegar. can this be used for both of those?

  • Mike
    Mike – Special Guest
    8/14/2017 12:06 PM

    @Fran these types of ferments typically require air flow, and so the Pickle Pipe is not necessary. However, for Kombucha's "second fermentation" where the goal is to carbonate your brew and make it fizzy, we have found that the Pickle Pipe is ideal and can help avoid a messy burst when the jar is finally opened. Hope that helps!

  • Fran
    8/14/2017 11:54 AM

    Also, in the video it shows a container with water in it placed on top of the rubber lids. Does that come with it? If not, is it needed?

  • Mike
    Mike – Special Guest
    8/14/2017 12:07 PM

    @Fran that was just a prop used to show that the built up pressure is released through the tip of the Pickle Pipe. It was only for demonstration purposes and is not required or part of the process at all. Thanks!

  • Nathan
    8/14/2017 12:10 PM

    Any plans for a Fido jar version? I'd prefer these be platinum silicone but since they're generally not in direct contact with food I'm willing to consider it. Perhaps you could drill a small hole in Fido lids then bond a silicone nipple to the top rather than making a whole cover of silicone?

  • Mike
    Mike – Special Guest
    8/14/2017 12:27 PM

    @Nathan thanks for the great suggestion! For now the line is only designed for Mason jars, to be compatible with the largest variety of jars in the widest assortment of sizes.

    As for the silicone, we're proud to undertake regular independent third-party verification of our products. Our silicone meets both FDA and LFGB requirements for food safety - these requirements extend far beyond simply BPA-free and Phthalate-free. If you'd like any further information about our commitment to safety, please just ask! Thank you.

  • Renee
    8/14/2017 3:21 PM

    I've been using these ever since the Kickstarter campaign that introduced them, and was even more pleased when you made the smaller sized ones available to fit regular mouth sized Mason jars. So simple to use, no worries with fiddly air locks and a cinch to clean. I use them several times a week for making quick countertop fermented veggies and afterwards storing them in the fridge requires nothing more complicated than removing the Mason top and slipping the regular disk onto the ring. Love the simplicity of using Mason top, the glass weight, an inexpensive jar, salt, filtered water, fresh veggies and my imagination for a steady supply of fermented goodness without worrying about air getting in to cause spoilage. And now that gardeners are sharing their abundant harvest of zucchinis and cucumbers Masontop kits are a nice way to say thanks:-)

  • Mike
    Mike – Special Guest
    8/14/2017 3:36 PM

    @Renee thanks so much for your kind words and sharing your positive experience with our products. We love hearing from our customers and playing a small part in helping others discover the joy and benefits of fermenting your own food at home. Thank you.

The launch day conversation has ended. Please direct further questions about this Grommet to our Community Experience Team.