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Professionals should handle the installation of a cat flap onto your door panel. The doors are typically made of the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulate polystyrene. It can be difficult to cut through these materials. It's much simpler to install a cat flap into the glass pane that is already in place or have a brand new door made with the hole already prepared. A Glazier can do this for you. Easy to Fit Upvc door panels can be an ideal option if hav