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Professionals should be responsible for the installation of a cat flap onto your door panel. The doors usually have a flimsy plastic exterior bonded to a soft, insulate polystyrene. These materials can be hard to cut. It's a lot easier to put the cat flap inside an existing glass pane, or have a new door constructed with the hole already prepared. A glazier will be able to do this for you. Easy to install Upvc door pa