Genuine Vacuum Filter for ShopVac 90304 / Type U

I thought the filter was coming in two pieces, one being the plastic bottom that screws on to tighten the filter up and snug. Instead it is one piece with one open bottom and the other end has a metal plate permanently attached to the bottom and the other end just friction seals. The rubber seal was too tight so I used a utility knife to trim inside diameter off the rubber to make it work and go on. It works fine just had to adjust on it.