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It is possible to put an animal flap into a door panel made of upvc, or a double glazing glass sealed units but the best solution is to purchase a brand new pane of glass with an already-made hole. Take note of the instructions that will be included in your cat flap kit and follow them carefully. Make sure the shape you've drawn (be it square or circle) is accurately represented on your template drawing. Safety A microchip-activated pet panel inside your door made of upvc is a great solution if you have a dog or cat and