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It is possible to install an apron flap inside an upvc panel or double glazing sealed unit. However, the most effective solution is to put in a new glass pane with an already-made hole. Read the instructions that should be included in your cat flap kit and follow them closely. Make sure that the shape you have drawn (be it square or circle) is accurately represented on the template. Safety A microchip activated pet panel in your door made of upvc is a great solution if you have a dog or cat and wa