Fermentation Lids, Airlocks for Fermenting, 4 Sets Fermentation Kit for Wide Mouth Mason Jars, Stainless Steel Fermenting Lids for Making Sauerkraut, Pickle, Hot Sauce (Jars Not Included)

These lids fit my mason jars perfectly. I love that I no longer have to put a drip tray under any of my ferments and I no longer need to "burp" the jars. Another plus is that there is no longer any chance of kahm yeast growth due to the air lock.

They fit wide mouth glass jars, as promised. The gaskets are easy to install, although I'm not sure what the point of having the little gasket cover is since it seems to pop out on its own. Not like I planned to use it anyway.

Came packaged well and easy to put together. The caps are a little hard to get off, but other than that I think had less growth of anything else on top of the brine than when using a coffee filter. The lid seals are great and just don't fill jar so high that you can't get the stem of the airlock to seal into the o-ring in the center.You can use the lid center o-ring cap to seal it and put in fridge if want. But I just use my regular mason jar lids. Liked them enough to buy a 2nd set.

Do a good job keeping air out, but hard to clean. Don't try to boil to sterilize - they will melt - ask me how I know.

Easy to use and easy to clean.

This worked. I made sauerkraut in jars and it turned out great!

Used these airlocks for many fermented veggies including kimchi, carrots, cauliflower, and more.

Didnt fit my jars. I thought these were all the same size. Regular and big mouth.