Silicone Fermentation Airlock Valve Lid With SS Band for Wide Mouth Mason Jars


Our silicone valve lid for wide mouth (3″ internal diameter) Mason jars will revolutionize your small batch fermentation in Mason jars! The “bubble” on the top has a slit cut in it. When pressure builds up in the jar, the lid bulges up. This automatically opens the slit and lets the CO2 produced by fermentation escape. No more burping and no more topping up the water in the airlock!

Made of 100% silicone rubber, these lid inserts are dishwasher, freezer, and microwave safe! Silicone is a safe, green, non-plastic (BPA free) material for food use that does not leach any chemicals.
Made of 304 grade 18/8 stainless steel, the band will not rust and is also dishwasher safe!

One silicone valve lid and one stainless steel wide mouth band per order.

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Product Description

These lids greatly reduce your chances of getting mold or kahm yeast in your ferment.

The truth about silicone valve lids:

All brands of silicone valve lids are not truly 100% one-way valves. At a certain point in the fermentation process, negative pressure is often created inside the jar. You may see your valve lid caving in, and a very small amount of air will likely leak into the jar. You may even need to pinch the valve to let air into the jar, so the lid can return to a normal position. This is undesirable, but in my testing I have found that it has a minimal effect. My ferments don’t seem to get moldy at any higher rate than with other airlock lids, and other people have good results using other brands of silicone valve lids. These lids are much more convenient because you do not need to monitor the water level in an airlock, they have fewer pieces to clean and assemble, they have a lower profile, and they are unbreakable. Personally, I think these benefits are worth the small extra risk of contamination.

Additional information

Choose Color

Bright Blue, Charcoal Gray, Lemon Yellow, Lemon Yellow (Small Slit), Light Coral, Mint Green, White


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