https://telegra.ph/Adding-a-Co....mposite-Door-Cat-Fla
http://nutris.net/members/home....greece88/activity/20
https://squareblogs.net/novelg....reece61/cat-flaps-fo
A through wall cat flap is a great way to let your pet come and go as they please. You must be careful not to put it too high into the wall. This could result in the loss of energy and also allow burglars to gain entry into your home. A gap in a cavity can also be a problem for future owners should you decide to sell your home. Cat doors made of glass are a safer alternative. Easy to install A