Quickly and conveniently frame your PX Powder Pet Door with the High Tech Pet Products WA Wall Tunnel for PX Power Pet Door. The tunnel eliminates the need for difficult framing while giving your Power Pet door installation a professional appearance. Made of extra-strength ABS composite, the frame fits snugly into the back of the Power Pet door and telescopes into the door's outside frame. Just cut the hole in your wall, mount the door as instructed, and slide in the tunnel. Installation typically takes two hours or less. In a range of sizes to fit your PX Powder Pet Door.