Quickly Easily and Professionally frame your PX-1 wall installation with our pre made Wall Mount Tunnel. Professional looking wall installation is easy with your pre-fabricated WALL ADAPTER TUNNEL. Your WALL ADAPTER TUNNEL eliminates the need for difficult framing of the hole you cut in your wall for the pet door passageway and gives your Power Pet door installation a high quality professionally finished look. Made of high-strength ABS composite this convenient Power Pet Door accessory fits snugly into the back of your Power Pet door and telescopes into the door s outside frame. Makes wall installation simple. Just cut the hole in your wall mount your Power Pet door with eight wood screws slide in your Wall Installation Tunnel mount your outside frame with another 8 screws. YOUR DONE! Installation typically takes 2 hours or less when you use this convenient time saving product. Allows Quick Easy Installation of your medium PX-1 Power Pet door. No product assembly required. No wall framing required. Gives your installation a professionally finished look. Typical installation time is 2 hours or less.