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It is possible to put the cat flap inside a upvc door panel or double glazing glass sealed unit however the best choice is to buy a new glass pane that has a premade hole installed. Follow the directions that should be included in the kit for cat flaps, and follow them with care. Make sure that the shape you have drawn (be it a square or circle) is accurately drawn on your template drawing. Safety If you have a dog or cat and want to allow them access to the garden without leaving the door open A microchip activated pe