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Adding a cat flap to your door panel is an important task to be handled by a professional. are typically constructed from a thin, plastic exterior, which is then bonded to an insulating, soft polystyrene core. These materials are often difficult to cut. It is much easier to fit the cat flap into an existing glass pane, or to have the hole drilled in a new door. A Glazier can do this for you. Easy to Fit Upvc door panels are an ideal