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It is possible to put an animal flap into the door panel made of upvc or double glazing glass sealed units, although the best option is to purchase a brand new pane of glass with a premade hole installed. Read the instructions that should be provided with your cat flap kit and follow them closely. Make sure that the template sketch accurately depicts the shape (circle or square). Safety A microchip-activated pet panel inside your upvc door is a great solution if you have a dog or cat and wish to let them out in