If the gasket seems a bit small, I put it in the lid like it should be. Then sit it on while the water heats. The heat makes it grow a little bit, and it fits perfect.What a great find! I pressure can quite a bit! I got mine for Christmas years ago and love using it I would rub some vegetable oil on the rubber gasket and give it a good once over. I know most extension offices will look it over and make sure the pressure gauge works if it has one etc. At least they used to.