PetSafe Wall Entry Pet Door with Telescoping Tunnel
Fitted with a telescoping tunnel, the PetSafe Wall Entry Pet Door is one of the most popular electronic dog doors around. This system alongside a double flap door design makes for an excellent insulation mechanism. It makes this electronic door energy efficient as it keeps out the weather.
The door itself is made from aluminum frames making it a durable one. You can install it into walls of a thickness of 4.75 to 7.25 inches. What makes this possible is the telescopic nature of the plastic tunnel. You can do the installation yourself too.