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Professionals should be responsible for the installation of a cat flap onto your door panel. These doors typically consist of a flimsy plastic exterior that is bonded to a soft insulation polystyrene core. can be difficult to cut through these materials. It's much simpler to install a cat flap in an existing pane of glass or have a new door made with the hole already made. A glazier is capable of doing this for you. Easy to install Upvc door panels can be an excellent option