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Professionals should be responsible for the installation of a cat flap onto your door panel. The doors usually have 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 install the cat flap on an existing glass pane or have the hole prepared for a new door. A glazier will be in a position to assist you. Easy to Fit If you have a cat and you want to allow them to enter and exi