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Installing a cat flap on your door's panel is an important task to be handled by an experienced professional. These doors are usually made of a thin plastic exterior, which is then bonded to an insulation-enhancing, soft polystyrene base. These materials can be hard to cut. It's much easier to install a cat flap into an existing pane of glass or have a new door made with the hole already prepared. A glazier can be capable of doing this for you. Eas