I use these lids on mason jars to store eggs under vacuum. Using regular tin can lids, I knew not to screw the lid too tight. The reason I bought these lids was to be able to use them multiple times. Ordinary tin can ends are metal and rusty. Only about 1/2 of the metal caps can be reused for sous vide. So I bought her. The manufacturer warns against over-tightening the lids when using silicone gaskets in liquid food lids (don't use silicone gaskets when storing dry foods). I tried not to tighten the lids more than a finger. Celebration. I screwed it in until I felt resistance, then loosened the screw about 1/2 turn. Still, I can't unscrew about 1 cap out of 4; My husband has to unscrew them. Eventually he manages to open them, but he keeps telling me not to screw the lids on so tightly. Those that stick also show a vacuum seal. I've tried all the unscrewing aids that are made, but I can't get them off. So this is just a warning for some potential customers who might not be that strong. I'll revise this review if I find a way to make the caps easier to unscrew.
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