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It is possible to install the cat flap onto the upvc panel, or even a double glazing sealed unit. The best alternative is to install the glass pane from scratch using an already-made hole. Follow the directions that came with the kit. Make sure that the drawing accurately represents the shape (circle or square). Safety If you have a cat or dog and want to allow them access to the garden without leaving the door open, a microchip activated pet flap inside your door's upvc panel is a fantastic option. It wi