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Professionals should take care of the installation of a cat flap onto your door panel. The doors usually have an ungainly plastic exterior that is that is bonded to a soft insulate polystyrene. It isn't easy to cut through these materials. It's much easier to install a cat flap into an existing pane of glass, or have a new door manufactured with the hole already made. A Glazier can do this for you. Easy to Fit Upvc