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Professionals should take care of the installation of a cat flap on your door panel. The doors are typically made of the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulating polystyrene core. It isn't easy to cut through these materials. It is a lot easier to fit the cat flap on an existing glass pane, or have the hole prepared in a door. A glazier can do this for you. Easy to install Upvc door panels can be an ideal option i