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It is possible to put the cat flap onto a upvc panel or a double glazing sealed unit. However, the best solution is to put in the glass pane from scratch using a pre-made hole. Follow the directions that should be provided with your cat flap kit, and follow them with care. Make sure the shape you've drawn (be it circle or square) is accurately depicted on your template drawing. Safety A microchip-activated pet panel inside your door ma