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It is possible to put the cat flap inside the door panel made of upvc or double glazing glass sealed unit however the best choice is to buy a new pane of glass with a premade hole installed. Follow the instructions provided with the kit. Ensure that the shape drawn (be it square or circle) is accurately drawn on your template drawing. Safety A microchip-activated pet panel inside your door made of upvc is a great solution if you have a dog or cat and wish to let them out into the garden, but don't want to open the do