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Professionals should take care of the installation of a cat flap onto your door panel. The doors are typically made of a plastic exterior that is attached to an insulating, soft polystyrene core. It isn't easy to cut through these materials. It is much simpler to fit the cat flap on an existing glass pane or to have the hole drilled in a door. A glazier will be capable of doing this for you. Easy to install If you have a cat and you want to let them in and out without leaving your home door panels made of upvc are a great solution. Th