I use this lid on 6Qt Instant Pot. It doesn't seem to fit right at first, but it actually fits well. When installing a lid on a pot, simply press the edges of the lid onto the pot. It snaps gently into place and is slightly snug on the potty. It may not feel like a snug fit for some people, but it stays in place without pulling back or popping out. Removing the lid is easy, while you can use your index finger to gently pry the rim of the lid off the pot. In addition, in the refrigerator we put the dishes with food on the lid, and it does not bend. It is very strong and strong, will not stretch/shrink. You don't want a cap that is too tight to put on or take off. Only an offer to the manufacturer. To make the lid a little tighter around the pot you can increase the depth of the ridge/ridge along the edges of the lid. This allows it to sink deeper into the rim of the pot and provide a tighter fit. (This may satisfy some customers who say it doesn't fit) My wife always makes hot soup in the Insta pot and then covers it with a lid. Later, when the pan has cooled, it is sent to the refrigerator. The lid stays in place for several days, won't remove, or pops out. Again no problem. As for tightness, yes, air doesn't get in/out. I lift the brim, push the cap down to release some air, and then close the brim. This causes the lid to flex inward due to the expelled air. It stays that way in the fridge. Later I lift the edge of the lid to let air in, then the lid lifts again. Note. Do not cover the pot with plastic wrap. This interferes with the silicone cap. The plastic wrap will make the edges of the pot thicker and the silicone lid will be difficult to hold. In general the product works well. to me.
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