PetSafe Wall Entry Aluminum Pet Door Extension for Cats & Dogs, Small

Designed to be compatible with the Wall Entry Aluminum Pet Door. Install your door in a wall more than 7 thick with this additional tunnel extension. The tunnel overlaps the pet door frame by 1 inch and fits walls 8 - 12 inches thick for the medium and large tunnel or 8 - 10 inches for the small tunnel. You can also cut the tunnel shorter if you need to install it in walls 7 - 8 thick. PetSafe brand is here to help you and your pet live happy together.

Compatible with the Wall Entry Aluminum Pet Door new model (PPA11-10915, PPA11-10916, PPA11-10917) Extends Wall Entry Doors From 7 1/4" To 12" Thick Tunnel Can Be Cut Shorter To Accommodate Walls 7 1/4" To 8 1/4" Thick