Without some form of gasket, Mason jar plastic lids are not airtight. Quality Reliable Products Mason Jar Silicone Seals fit snug into any brand Mason jar plastic lids. We tried the narrower red rubber seals with the smaller outer diameter. They tend to become displaced while tightening the lid, and unfortunately, they did not keep our fermentation jars airtight - see photo. Our reliable seals provide a perfect airtight, anaerobic enclosure while fermenting Kimchi (vegetables) or Kombucha (tea). We ferment on a very large scale, and our Seals do resolve the airtight issue. When testing our Seals by placing water in a jar and shaking the jar, we experience no leaks.
These seals are made wide enough that they will seat against the roof of the cap completely underneath the grooves of the cap and cannot fall out while putting the lid on the jar. OVERTIGHTENING COULD DAMAGE THE SEAL AND MAKE IT DIFFICULT TO REMOVE THE CAP!
Metal vs. Plastic Lids use for fermentation and storage of fermented foods? We find that whatever we are fermenting does not normally come in contact with the lid during fermentation, but however, may briefly come in contact with the lid during storage. We've done the research, which reveals that metal shouldn't be used during fermentation, nor for storage of fermented foods.
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Guide
for Turning a Mason Jar into a Food Fermentation Vessel
6 each 3-Piece Fermentation Airlocks, Acrylic
12 each 3-Piece Fermentation Airlocks, Acrylic
1 each Mason Jar Drinking/Fermentation Lid Cap Food Grade Grommet, Seal, Stopper
6 Mason Jar Drinking / Fermentation Lids Caps Food Grade Grommets, Seals, Stoppers
12 FERMENTATION CAPS Installed Food Grade Silicone Grommets, Seals, and Stoppers
STARTER
KIT Mason Jar FERMENTATION LID w/installed Grommet Seal Stopper Airlock
BEGINNER FERMENTATION KIT 6 Mason Jar Lids Seals Grommets Stoppers & 2 Airlocks
6 Mason Jar FERMENTATION LIDS w/ Installed Grommets, Seals, Stoppers, & Airlocks
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