https://clinfowiki.win/wiki/Po....st:Through_Wall_Cat_
https://botdb.win/wiki/Cat_Fla....p_Installation_How_t
Professionals should handle the installation of a cat flap on your door panel. The doors are typically made of an ungainly plastic exterior that is bonded to a soft, insulating polystyrene core. These materials can be hard to cut. It is much simpler to install the cat flap on an existing glass pane, or to make the hole in a new door. A glazier is in a position to assist you. Easy to install If you have a cat and would like to let them in and out