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It is possible to install the cat flap inside a door panel made of upvc, or a double glazing glass sealed unit but the best solution is to buy a new glass pane that has an already-made hole. Follow the instructions provided with the kit. Make sure that the shape you have drawn (be it a square or circle) is accurately drawn on your template drawing. Safety A microchip activated pet panel in your upvc door is a great solution for those who have a dog or cat and wish to let them out into the garden, but don't wa