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Professionals should handle the installation of a cat flap onto your door panel. These doors are typically constructed of a thin plastic exterior, which is then bonded to an insulation-enhancing, soft polystyrene base. It isn't easy to cut through these materials. It is much easier to put the cat flap into an existing glass pane, or to make the hole for a new door. A glazier is able to do this for you. Easy to Fit If you have a cat and want to let them in and out without having to leave your home door