The Hale Security Pet Door for walls is the best vinyl flap style pet door on the market. It is self-framing from 2 ½" to 10". Optional tunnels are available during the checkout process at 16" thick, and add 10% to the cost. Hale provides carpeting for the aluminum sheet-metal tunnel section. They use a clear vinyl flap with brush weather strip insulation around the flap to seal it to the frame. A double flap pet door (recommended for better insulation) has a flap on the inside of the door and a flap on the outside of the door, with an insulating dead air space in between. The Hale pet doors also use magnets on the sides and bottoms of the flaps for the best wind resistance in a vinyl flap door. Hale has the largest number of sizes available of any pet door manufacturer, making it easy to find a door for any pet.
The locking cover is made from a tough color matched UV resistant marine grade Starboard plastic that comes with a steel springloaded lock for maximum security. Wall mounted pet doors are sometimes installed under a window sill or cabinet or other obstruction that prevents the locking cover from sliding in on top. If this is the case for you, you can order a sideways sliding locking cover instead of a top loading locking cover. When you go through the ordering process you can state whether you want the locking cover to slide in on the left, right, or the top.
The pictures of the frame colors will vary with your particular monitor and the brown background on the pictures doesn't do us any favors, but they are shown to give an approximate idea of the colors available. Satin is actually a brushed aluminum, similar to the bottom of a soda can. A good description of the beige is like coffee with 2 creams in it. White is bright white, bronze is almost black.