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It is possible to insert a cat flap into an upvc panel or double glazing sealed unit. The best option would be to install an entirely new glass pane that has a hole that is already made. Follow the directions that came with the kit. Make sure that the illustration accurately depicts the shape (circle or square). Safety A microchip activated pet door in your upvc door is a fantastic option when you have a pet or cat and would like to let them out in the garden, but don't want to leave the door open. It will allow only your pet to go in while preventing other pets