Fermentaholics Silicone Fermentation Stretch Lids - Waterless One Way Airlock Cap Fits All Wide Mouth Mason Jars - PATENTED Design - With One Lid Turn Any Mason Jar into a Vegetable Fermenter (1)

These rubber jar covers work really well at keeping dust and bacteria out while letting gasses and fluids out during the fermentation process. They take a little stretching in your hand first but after they’ve relaxes a bit, they fit and seal quite well over most wide mouth jars! Very easy to use and I’ve used one multiple times and it’s still good to use again!

Very easy to use. They make fermentation projects fun and easy to maintain. I plan to order more next season

They work as intended and I think the airlock design is great with the steel ball and washer. Having used them quite a bit now and comparing them to the ones my friends have, I would say they have definite pros and cons. As I mentioned, the airlock mechanism is great. The only thing I’m not a fan of is the stretch fit. If you have any moisture on the rim, they will not seal and will slide up. This is a bit of a double-edged sword though, because I like that you don’t have to deal with rusty bands because of salt in the brine. Definitely a solid 4 for me and I will use them.

Used for one batch. They were easy to wash before I used them. No problem stretching over a standard wide-mouth canning jar. I used 1 quart jars. They feel thin to stretch over something that's pretty big but didn't seem near tearing. Most guys are familiar with this experience LOL. I haven't tried a wider-mouthed jar like some other reviewers posted. They sealed well. I used a glass weight to hold the vegetables under the brine. The pickles produced are good. Try eating pickles with fresh hot rice if you haven't before.

Good product

1 - the valve leaks and air goes in the jar 2 - it’s easy to dislodge the tiny metal ball inside the valve while you are cleaning the lid. Tiny ball disappears into your sink and the thing now is worthless. So not a durable product.

Seams kinda flimsy. Just put one on my Fire Cider and will see how it does. I will update as the fermentation process goes.

Only reason I gave it 4 instead of 5 stars for “leakproof” is I didn’t leave enough headspace in my jar and it bubbled up through the vent hole….my fault really!

Muy cercano a lo que buscaba, una evaluación más completa la daré con el uso. De momento satisfecho con el producto

Great idea, I have been using them for almost 2 years, but these lids do not vent the gases during lacto fermentation, you still have to burp them.