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It is possible to install an animal flap into the door panel made of upvc or double glazing glass sealed unit but the best solution is to buy a new glass pane that has a premade hole installed. Follow the directions that should be included with your cat flap kit and follow them with care. Make sure that the shape you have drawn (be it square or circle) is accurately drawn on the template. Safety If you have a cat or dog and would like to let them in the garden without leaving t