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It is possible to insert the cat flap onto the upvc panel, or even a double glazing sealed unit. However, the most effective option would be to install the glass pane from scratch using an already-made hole. Follow the directions included in the kit. Make sure that the shape you have drawn (be it square or circle) is accurately drawn on the template. Safety A microchip activated pet door in your door made of upvc is a fantastic option if you have a dog or cat and wish to let them out in the garden, but do not want to o