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It is possible to install a cat flap into the upvc panel, or even a double glazing sealed unit. The best alternative is to install a new glass pane with a pre-made hole. Take note of the instructions that will be included with the kit for cat flaps, and follow them closely. Make sure that the template drawing accurately represents the shape (circle or square). Safety A microchip-activated pet panel inside your door made of upvc is a fantastic option if you have a dog