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It is possible to install the cat flap onto the upvc panel, or even a double glazing sealed unit. The best option would be to install an entirely new glass pane that has a pre-made hole. Follow the directions included in your kit. Make sure the shape you've drawn (be it circle or square) is accurately depicted on the template. Safety A microchip-activated pet panel inside your upvc door is a great solution when you have a pet or cat and wo