PetSafe Aluminum Pet Door Extension Tunnel for Wall Entry - Durable & Weatherproof Dog & Cat Door Accessory for Indoor/Outdoor Use

Very simple looking. You can close it up, if you need to.I needed one that had the ability to expand through the wall on a brick home as the thickness was more than the normal wall mounts gave you however this extension for the petsafe door made it perfect!I am on my 2nd doggie door from this company and I have always needed the extension tunnel. At my previous house it was a perfect fit. At my new house, due to Styrofoam insulation, this doesn't fit as well. I could use another 1/4 to 1/2 inch. We resorted to duct taping the inside and the dogs are fine with it and it's lasting.This does not line up with either side of the door. Now I’m going to have to come up with something to cover the gaps. The dog won’t go near it and he was raised with a dog door.Works well to extend the large pet safe dog door through my brick exterior wall. Sturdy metal. Yes you have to use tape to install per instructions, but I didn’t mind this very much. It works and solves the problem.east to install and a must for 2x6 extirior walls. the weather proofing could be better it seems like they are relying on the extirior doorEasy to install, it works great.We installed our PetSafe door So simpleStill a bit small for UK walls but we made it workNeed it with dog flap to finish job offFar too expensive for what it is, no fixings so relying on pet flap to secure it.