Second construction, second pet door from them. It is the most well done one on the market. Solid, minimal, not bad for cold countries, it lasts very long. The guy that helped me to get it fast did its outmost to accommodate me. Expenvive but worth it.

I have spent less that half the purchase price on another door (PetSafe) and gotten the same quality.

This door has a tiny screw lock that you must use to lock/unlock the security panel rather than a pin lock. Per the online instructions and the instructions received with the door, it has a pin lock which is much easier to use. When I called about the lock I was told the pin lock is used on the Max Seal Door (about $600.00 for the size I ordered) and the sent/online instructions are for that door. If shipping was not so expensive I would be sending these back.

This is a good solid unit, all heavy duty metal and built to last. Easy to install and good instructions - the metal of the tunnel is pretty stout and took some effort to cut with tin snips, but worth it to have such a strong finished product. I've used Security Boss window units often in my catio business, and really like their flaps - thick and durable but easy to push through, and really good weatherstripping and dual magnets keep drafts and bugs out.