Leak Proof Platinum Silicone Sealing Lid Inserts/Liners for Mason Jars (10 Pack, Wide Mouth)

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These are perfectly acceptable Mason jar seals, but they are for standard-size lids, not wide-mouth lids. I elected not to return them because I can use them in other ways, but if you are looking for seals for wide-mouth Mason jars, this product is not it.

Just put a pinhole through each of these silicone lid inserts about half an inch from the center, screw them onto the top of your jars with metal bands, and you've got yourself great airlocks for all of your lactic acid fermentation pickling! They work just like Masontops Pickle Pipes , but better and cheaper. Put the pinhole about half an inch from the center - not in the very center where the silicone is visibly dimpled in and thinner. The pinhole acts as a pressure relief valve, letting air through only when the pressure difference between the inside and the outside is great enough. During fermentation the lid insert bulges upwards, which tell you that a substantial pressure difference is required to push any air through the pinhole. That means the pinhole does not let any air leak through when the pressure difference is small, which means the lid inserts can still be used as regular jar seals when you're not fermenting. A bulge also tells you that the pressure inside the jar is higher than outside the jar, which means air can only move from inside to outside and nothing can get in. The pinhole won't get bigger over time, so the pressure relief valve's performance is maintained over the long term. The lid inserts fit perfectly inside metal bands or Ball plastic caps, so they are perfectly centered on the rim of your jar. They have a groove and ridge around the edge that holds them tightly in place and prevents them from pulling away from the rim of your jar when under pressure. They're thick, and easy to clean, and not too expensive. Pickle Pipes are worse in all of those respects. Pickle Pipes have a pressure relief valve that weakens over time. They are too small, and hard to center on the jar, so they can pull away from the rim during fermentation. They have no groove or ridge to hold them in place at the rim of the jar. I use these lid inserts for pickling vegetables for one week. I've done many batches and never had a problem.

Silicone liners are the best quality. Thick silicone that will last and last. Loved the first set I bought that I had to buy another to have some to gift to my Mom. Also gave me some to stash away for later, just in case you know. Use these in my half gallon jars for Cold Brew on the semi truck ;) No leaking. Paired with the silicone half gallon jar sleeves- so perfect.

These might be a tad pricey for what they are, but they do exactly what I need them to do so I am giving 5 stars! I meal-prep salads in jars for the week and then just toss them in my bag (they take up less space than bowl-shaped containers and are glass but not as heavy as my pyrex containers). I had been re-using the metal rings and seals that came with the jars, but they got too rusty to continue so I replaced them with plastic lids and these seals. Just a note, the divet in the seal faces into the lid and fits over the little plastic ridge of the lid -- the first few times I thought that divet was supposed to face down onto the jar lip. They fit pretty well before, but now that I've figured that out, they fit perfectly! So perfect that they're kind of hard to pop out to clean, but maybe I can just throw the whole thing in the top rack and not worry about it.