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Installing a cat flap on your door panel is an essential task to be handled by an experienced professional. These doors are usually made from a thin, plastic exterior that is bonded to an insulation-enhancing, soft polystyrene base. These materials can be difficult to cut. 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 Fit If you have a cat and would like to let them in and out without having to leave y