I suspect that Amazon is mashing a bunch of our reviews for slightly different products into one list of reviews, so take this with a grain of salt- you may be looking at gasket XYZ, and I intended it to be written for gasket 123. But, I bought the Mirro 9882 gasket to go with a 1983ish Mirro Pressure Cooker, style M-0622. When it arrived, I was concerned because it seemed to be too big to fit properly by about an inch. I was mad. I had followed instructions exactly, and it seemed way too big to work. But, the packaging all swore it was the right thing, and I had some time to kill so I did a pressure trial. It did leak in the beginning stages and seemed to take a long time to get to pressure, but it eventually totally stopped leaking and did get up to the 15 lbs pressure I was aiming for. I let it depressurize normally. When I took the lid off, I was shocked and amazing to find that now the gasket fit perfectly. It works great and comes up to pressure much more quickly than it did the first time.