2nd one I have purchased. It works well.

Love it, is the second one I've had.

This insulated door is better than the single flap but still allows some cold air in. I cut out a piece of thin foam insulation that I can press into the hole for real cold nights and that keeps the drafts out and my dog can still put it thru if he need to go out.sh

I had a pet safe medium door but this would not replace. Should be for new construction only.