7pack Maintenance free airlock waterless fermentation lids for wide mouth mason jars. Make Sauerkraut, Kimchi, Pickles, any fermented vegetable probiotic foods. BPA free, mold free, dishwasher safe.

Perfectas! Totalmente lo que esperaba

these work great for me.. I've been using them for months, dozens of times making sauerkraut, kimchi and mostly my favorite.. spicy garlic dill pickles! Id buy again in a heartbeat. I dont bother with the date coding feature.. nice thought but i never use it.

These are wonderful, I love them! What I especially appreciate is you can set the little dial to the date you started your ferment.

These are so much better than the kind that stick up you have to put water in. I fermente a lot of food items & they have not let me down once.

These work as advertised. However the burping apparatus isn’t the upward triangle: that’s just for indicating when you started your ferment (there’s a ring of embossed 1-31). The burp “system” is just the fact that the center piece is shaped a bit like a Oreo cookie so the narrower part in the middle goes into the hole in the middle of the second outer silicone part. There are a few holes that are covered via friction with the centerpiece, but in case of catastrophic pressure the centerpiece would just be dislodged or possibly shot out. I sound like I’m criticizing it but it works quite well. I just wish the date indicator wasn’t so upright as now I’m unable to put anything on top of these as they’re fermenting. Perhaps that’s to prevent excess downward pressure on the system, but I’d still consider that a slight design flaw. I love all silicone products though: durable, heat resistant, it’s great. So far I’ve made four mason jars of sauerkraut which is soooo much better than store bought, and you make your own probiotics at home.