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Professionals should be responsible for the installation of a cat flap onto your door panel. The doors are typically made from a thin, plastic exterior, which is then bonded to an insulation-enhancing, soft polystyrene base. These materials can be hard to cut. It's much simpler to install a cat flap in an existing pane of glass or have a brand new door manufactured with the hole already prepared. A glazier is capable of doing this for you. Easy to Fit Upvc d