Sophico Silicone Fermenting Lids, Waterless Airlock Fermentation Tops Mason Jar Lid Fermenter Caps for Pickles, Kimchi, and Fermented Probiotic Food - 4 Pack, Wide Mouth (Jars Not Included)

I really like these for my sourdough jars. They are easy to clean and fit really well in the better than bouillon jars I prefer. They are slightly wider than wide mouth canning jars, which these also fit in, just rather snug.

Worked for my first time pickling in my fridge. I’m a beginner and these are a cheap reusable item. They are light and won’t rust like if you want to replace the lid with this thing as well.

Love them

To be fair I haven't used yet but material is good quality and I feel will be easy to use.

work great for fermenting vegetables. I like cauliflower and carrots best. Adds tang to salads, good for snacks, and good FOR you.

These work great for storing dough dough starter! These lids protect the fridge from explosions if starter gases.

I lacto-ferment cabbage at least once every other week. I love these because they fit my existing mason jars and can continue to be used as a lid until I am ready to ferment up more saurkraut; did I mention that they're also super easy to clean and durable?My ferments have come out perfect every time I use them, you get a better seal than using the finger-tight method, and adequate venting only when needed; I love these lids.

I like that they fit in the jar opening and don't need to be screwed on/off. Just press the top to vent. Easy. So far, so good!