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It is possible to put a cat flap into the upvc panel, or even a double glazing sealed unit. The best option would be to install a new glass pane with a hole that is already made. Follow the instructions provided with the kit. Make sure that the illustration accurately depicts the shape (circle or square). Safety A microchip-activated pet panel inside your upvc door is a great option for those who have a dog or cat and wish to let them out in the garden, but don't want to open the door. This will only allow