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Installing a cat flap on your door panel is an important task that should be completed by an experienced professional. The doors usually have the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulate polystyrene. It isn't easy to cut through these materials. It's much easier to install the cat flap inside an existing glass pane, or have a new door constructed with the hole already made. A Glazier can do this for you. Easy to install Upvc door panels can be an ideal