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It is possible to put the cat flap inside the door panel made of upvc or double glazing glass sealed units but the best solution is to buy a new glass pane with an already-made hole. Follow the directions included in the kit. Make sure the shape you've drawn (be it circle or square) is accurately depicted on your template drawing. Safety A microchip-activated pet panel inside your door made of upvc is a great solution when you have a pet or cat and wish to let them out in the garden, but do not want to open the door. It w