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It is possible to insert a cat flap into a upvc panel or a double glazing sealed unit. However, the best alternative is to install an entirely new glass pane that has a pre-made hole. Read the instructions that should be provided with the kit for cat flaps, and follow them closely. Make sure that the template illustration accurately depicts the shape (circle or square). Safety A microchip activated pet door in your door made of upvc is a fantastic option for those who have a dog or cat and want to