Mason Jar Fermentation Airlocks

By Masontops

Starting at $21.95

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These mason jar fermenting lids not only keep out air, they also let the built-up gases escape, so you don’t have to. They create the perfect conditions for good-for-the-gut bacteria to emerge and preserve your veggies. Just set, forget, and enjoy some homemade sauerkraut, pickles, kimchi, or whatever else you decide to ferment.

  • Materials: BPA- and phthalate-free, food-grade silicone
  • Care: Clean airlocks before each use in the dishwasher or by hand with soap and water
  • Includes four waterless fermentation airlocks (red, teal, purple, blue)
  • Instructions: Screw it on with any standard mason jar band
  • Simple one piece design
  • One-way valve automatically regulates the pressure and ventilation in mason jars
  • No maintenance or monitoring required, unlike traditional water-based airlocks
  • No need to burp jars, maintain water levels, or keep track of complicated airlock systems
  • Easy to store and clean
  • Low-profile design allows for fermentation in tight spaces
  • Eliminates risk of mold
  • Made in China
  • Dimensions: Regular: 2.7" x 2.7" x 0.75";
    Wide: 3.31" x 3.31" x 0.75"
  • Weight: Regular: 0.04 lb.; Wide: 0.05 lb.

4 Reviews (4.5 out of 5 Grommets)

Sorted by Rating


2/13/2019 by Pilar



like it

10/19/2018 by R. K.

This was a gift; she said this assortment worked very well.


New Kitchen Tool

5/11/2018 by Adele

Wish I had seen these sooner. Glass weights-great. I make sweet/sour red cabbage,especially for holiday dinners. The recipe book is very handy,willy,will make a couple of these recipes soon.THANKS.More > < Less


still trying to use these

2/16/2019 by Carol

I'm getting mixed review here. Maybe I'm doing something wrong....

4 Item(s)

Masontops | Mason Jar Fermentation

About Masontops

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 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.