They added a quality metal spring hinge door. My Catgenie already looks like an attractive Modern space age Appliance. Now they added the door for the finishing touch.My cat Sheba loved the door from the start. She started playing batting at it with her paws. In a very short time she went through the door and went to the bathroom. Now when I go to the bathroom a lot of the time she runs in ahead or behind me and jumps through the door. Sheba loves her privacy and the door and she likes to go the same time I go and when she does I'm telling you, You can't smell a thing, I mean nothing! I recommend the door to all Catgenie owners. I feel it's a must. You'll thank me after you receive it. PS.I'm waiting for someday the Catgenie to talk to ya. HaHa!