I needed a replacement flap for the dog door in my slider and found this. Best price I was able to find. Shipped and received very quickly. I'm satisfied.
easy as pie by smiley's mom from La Luz, NM11/04/2011
Replacing the flap on the Petsafe door was simple and quick.
Just to be sure of the instructions, I went to YouTube and watched a video of a young lady demonstrating the installation. It was, indeed, "easy as pie."