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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 best option would be to install an entirely new glass pane that has a pre-made hole. Follow the instructions provided with your kit. Make sure the shape you've drawn (be it a square or circle) is accurately depicted on the template. Safety A microchip activated pet panel in your upvc door is a great solution if you have a dog or cat and want to let them out into the garden, but don't want to l