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It is possible to install a cat flap in the door panel made of upvc or double glazing glass sealed unit but the best solution is to buy a new glass pane with a premade hole installed. Follow the directions that should be included with your cat flap kit and follow them carefully. Make sure the shape you've drawn (be it a square or circle) is accurately depicted on your template drawing. Safety If you have a dog or cat and would like to let them into the garden without having the door open A microchip activated pet flap inside your door panel made of upvc i