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Installing a on your door is an essential task to be handled by an experienced professional. These doors are typically constructed of a thin plastic exterior that is bonded to an insulating, soft polystyrene core. It isn't easy to cut through these materials. It is much easier to install the cat flap into an existing glass pane, or to have the hole drilled for a new door. A Glazier can do this for you. Easy to Fit Upvc door panels are a great option if you have a cat at home and want to allow it to enter and out of yo