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)

These work really well! I'm fairly new to fermenting, but I've had great results using these lids compared to regular mason jar tops or the pop lids.

Fits jars well.

These fit wide mouth jars perfectly. I love that they’re one piece, dishwasher safe, easy to use, work well, and cute. They’re made for pickling, so with enough internal pressure, gasses can escape from the little flaps at the top. You could probably fit a straw through the opening too. I use these as a plastic free storage solution and mainly have fruits or leftovers and the seal is enough that nothing dries out in the fridge.

These fit perfectly, but the lid will pop-up instead of venting via the little x in the center. They also hold the scent of the ferment, even after washing and sanitizing. I will not buy silicon lids again. These might be nice for dry goods you get into frequently, if they weren’t so stinky from the ferments. I do like the ease of putting them on and removing them.

These work great for releasing ferment gases without needing burping or a water airlock. Highly recommended!

These work wonderfully when making a Ginger Bug. I’m sure it would work well for a sourdough starter.

These work and I can't knock them too bad, but I want to be clear about expectations here. I'll go through the pros and the cons, but let me start with my use scenario. I process a TON of peppers and I use lacto-fermentation as the first of a few processes I use to make either pickled peppers or hot sauce. ALL of my peppers range between low-heat peppers like Hungarian wax peppers to high heat varieties (but not super hots) like Scotch bonnet peppers and habaneros. Lots of jalapenos, serranos, etc. I avoid peppers like ghost peppers or Carolina reapers and the like, as I prefer open-pollinated traditional peppers for the most part. My ferments range from 6-10 days, seldom more. So now let's start with the pros of these lids: 1) They fit snugly in a wide-mouth Mason style jar. 2) The release valve does work. It's a simple cross cut into the silicone lid that seals, but when pressure builds, the slots push up and open slightly to let off gas. 3) When used with glass weights to hold down the contents in your jar, lacto-fermentation does occur as it should. 4) At roughly $2.50 per lid at the time of this review, I would note that the affordability ratio is amazing. 5) Through several cycles, I have had almost zero mold. In fact, the only place I've seen a speck of it is on the silicone itself at the sealing rings. And it was a SPECK. It did not damage the contents. Now let's get to the cons. 1) You must not overfill your jars as the lids are not "held" in place. They are pushed down. if there's is pressure coming up from contents below, it will push the lid up and break the seal. 2) Unlike the Mason brand lids I use or even the vacuum sealed lids that you draw air from with a pump, I have had moderate issues with kahm yeast buildup. This doesn't ruin the ferment or damage the peppers, but I don't use the brine when I process them into sauce. It's too strong. 3) I have dealt with some slime, likely an effect of kahm yeast. It has not damaged the ferment, but, again, I have to drain off ALL the brine when this happens. Of the three lid types I use, including two others that actually screw on to the jars, these are my least favorite. They work, but the formation of kahn yeast limits the usefulness. When pickling pepper slices, this is forgivable, as I move them into a vinegar-based brine and discard most of the lacto-liquid, but when making sauce and seeking a depth of flavor similar to a sriracha or similar sauce, these just don't cut it for me. I do think the value and the fact that they do work still makes them worth of three stars.

This is great, better than the old way!

Muy útiles para fermentar

Bought these as they were one of the ones recommended by a fermenting pro as being safe and easy to use. Make sure you read the instructions on the box for using them though. I automatically assumed that they 'auto-vent' when the pressure builds up. Discovered one morning that the kimchi I had fermenting had lifted the lid and there was kimchi juice all over the table. Must have been quite a show! THEN I read the box and realized that you are supposed to press down on the middle of the lid once the fermenting starts once or twice a day (or whenever you see it starting to bulge) and THAT is what releases the gases. Lesson learned. But sure proved to me that these lids seal on the jars pretty darn well! Very happy with them.

Trouble free. Easy to clean.

These tops are a very clever design. I would have loved to be able to use them for my Super Gut yogurt fermentation. I have a lot of silicon products in my kitchen. None of them have an odour, however these tops have a strong smell which makes me question what material they are made of, and are they food safe. I will be returning them, sadly.