I got this gasket, knowing it may not be the right one for my cooker. It took a little while to get it, but it does work for my cooker! I soaked it in hot water for 10 minutes or more, then stretched it just a little, since that is what my original one said to do...and it was really big...I had to work a little to get it in the cooker lid, but I got it in and I've been using it ever since. So, I would not stretch it any, but I do recommend this gasket. Now, I just need to get a few more...for backup! My original gasket lasted for around 10 years, and I'm really hoping this one will last at least that long...Happy Canning!