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It is possible to put the cat flap onto the upvc panel, or even a double glazing sealed unit. However, is to install an entirely new glass pane that has a pre-made hole. Follow the directions included in the kit. Make sure that the template illustration accurately depicts the shape (circle or square). Safety A microchip activated pet door in your upvc door is a great solution when you have a pet or cat and want to let them out in the garden, but don't want to leave the door open. This will onl