Excellent product. Perfect for fermentation. Extremely durable and work fantastic. Will definitely be purchasing more of these.

They are a bit expensive for 4 of them. But they are easy to use and have made fermenting foods easier, as the jars burp themselves.

Got 'em. They arrived timely and have worked great, so far.

This is my 2nd order of these as I was fermenting some spicy kimchi and realized I need more lids to ferment garlic and some other things and I didn't think about using another brand - Masontops are top quality at a fair price. These lids make it so easy to leave and forget it for a few days/weeks as you don't need to manually burp your jars. The only suggestion I have is to put the jars in a container or on a rag as sometimes when they do release air a small amount of your liquid comes out as well and it will leak down the side of the jar. But for the ease of using and being able to go out of town for a few days and still ferment, that is well worth the price of a little preparation for my countertops.

I love these things. Work as they should and eliminate the need for me to "burp" my jars. Easy to clean and don't take up space in the kitchen drawer.

I've been fermenting quite a bit. I have had failures with water-airlocks, but never a failed ferment with these. Not to say it can't happen, but if you pick your produce well and chemical-free, no-wax, and if you sanitize your jar, weight and top, these tops clearly minimize chances for failed fermentation.

Pros: Easiest to use, easiest to clean, sturdy and flexible material, consistently great quality.

Cons: Really expensive for 4 slabs of silicone sold in a cheap plastic container.

Tip: I spray my jars, weights and lids and airlocks with 3% Hydrogen Peroxide to sanitize them. Mist them all over and let them sit in it for 15 to 20 seconds, then rinse in distilled or filtered water. Tap water can kill your ferment, folks! I've learned to make my brine in a big pyrex measuring bowl. I weigh 7 grams or one level teaspoon of kosher salt or pickling salt into each cup of filtered water. I make extra brine, usually a quart, because I'd rather have too much than too little brine. I layer my veggies, herbs & spices, leaving lots of room at the top of the jar! place my weight, then add the brine very slowly to cover it all! Pouring slowly pretty well stops air bubbles from getting trapped under the veggies. I only use plastic utensils to stir the brine, and I'm sure wood works too, but they tell us not to use metal in our ferment because metal has antibacterial qualities. It's fine to use a metal Mason jar ring outside over the Pickle Pipes to hold them down.

Good luck with your ferments!

Fermenting sauerkraut and kimchi in mason jars. These have worked well for me.

I’m a beginner, and these worked well for me!

Great for fermenting, release gasses well and seal up well too.

I'm thrilled with these! And they arrived much earlier than I expected. :)

These fermenting lids work great. I have a set of the wide mouth jar ones and they work so well that I purchased these regular mouth jar ones. Currently being used for my fermented ketchup that has a tendency to burn it a regular jar lid is even slightly too tight. Since they are silicone, they are non staining and I don't have to worry about outgassing or the acidy ferments damaging them and ruining my fermenting. They are way easier to use than standard fermenting lids. If I am making multiple versions of a certain ferment I can colour code it with the coloured lids based on the recipe I am using.

Highly recommend.

Permite usrlos en los botes de Mason Jar, permiiendo que respire sin tener que abrir el bote, totalmente recomendable, estoy entusiasmada

Ils sont adaptés à mes bocaux Kilner large ouverture de 500ml. Je vais faire seulement des petites quantités de légumes fermentés. They fit my Kilner 0.5l wide mouth jars. I will only make small batches of fermented vegetables

Perfetto