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It is possible to install the cat flap inside a door panel made of upvc, or a double glazing glass sealed units but the best solution is to have a new glass pane that has an already-made hole. Follow the instructions provided with your kit. Ensure that the shape drawn (be it a square or circle) is accurately represented on the template. Safety If you have a cat or dog and would like to allow them access to the garden without having the door open, a microchip-activated pet flap on your upvc door panel is a fantastic option. This will on