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It is possible to insert a cat flap into 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. Read the instructions that should be included with your cat flap kit and follow them with care. Make sure that the shape you have drawn (be it circle or square) is accurately depicted on the template. Safety A microchip-activated pet panel inside your door made of upvc is a great option when you have a pet