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It is possible to put the cat flap onto an upvc panel or double glazing sealed unit. However, the best alternative is to install the glass pane from scratch using a hole that is already made. Follow the directions that came with the kit. Make sure that the drawing accurately represents the shape (circle or square). Safety A microchip activated pet panel in your door made of upvc is a great option if you have a dog or cat and would like to let them out in the garden, but don't want to open the door. This