I purchased the Hale Pet Door in the Screen version. We originally had one that we bought from Petco, however, that one attached to the screen and our dogs kept knocking it out AND we had it installed by a window/screen repair shop. We decided that this summer we would do something different. We did some research and purchased the Hale Screen Pet Door directly from Hale. It was much more expensive than the one we purchased at Petco. This door attaches to the frame of the screen and the screening and NOT just the screening by itself like the old one. We decided to install it ourselves. It took my husband and I about 1/2 hour to install it. We've had it in over a week and it's WONDERFUL! Three dogs are using it all day, every day. My kids actually said that the screen door itself feels sturdier with the pet door in, than without it.