At first I thought I ordered the wrong size because I couldn't squeeze it far enough for the vacuum to engage. I kept trying and finally got it. This is always a risk when using third party replacement parts. They're a little on the big side, but they still work (suck in a lot) and are still good value for money. I think it's better to be this tight than too loose and allow air through the sides of the filter. I now have additional funds on hand when needed. I would buy again, but I probably never have to. All of this will survive the vacuum.