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It is possible to put an apron flap inside a upvc panel or a double glazing sealed unit. However, the most effective solution is to put in the glass pane from scratch using a pre-made hole. Follow the directions that came with your kit. Make sure that the shape you have drawn (be it circle or square) is accurately drawn on the template. Safety A microchip activated pet panel in your upvc door is a great solution for those who have a dog or cat and would like to let them out into the garden, but do not want to open the door. Th