The Lexan Dual Pane Dog Door features a transparent double pane Lexan flap allowing your dog to see through the door. The aluminum frame and lexan flap helps to deter chewing. This dog door includes an easy to use twist lock to block off animal access. There is also a closing panel that can be attached quickly via thumbscrews on the panel to block access. Replaceable gaskets eliminate most drafts maintaining a good weather seal. The door frame is constructed of brushed aluminum giving this dog door a modern appearance. Tunnel for the wall mount is assembled by sleeving the interior and exterior frames together and inserting filler panels.