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Professionals should take care of the installation of a cat flap on your door panel. These doors typically consist of the plastic exterior, which is thin and flimsy, and then bonded to a soft, insulating polystyrene core. These materials can be difficult to cut. It is a lot easier to put the cat flap inside an existing glass pane or to make the hole in a door. can do this for you. Easy to Fit If you have a cat and want to allow them to enter and exit without ha