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It is possible to put a cat flap in the door panel made of upvc or double glazing glass sealed unit but the best solution is to purchase a brand new glass pane with an already-made hole. Follow the directions that came with the kit. Make sure the sketch accurately depicts the shape (circle or square). Safety A microchip activated pet door in your door made of upvc is a fantastic option when you have a pet or cat and wish to let them out in the garden, but do not want to leave the door open. It will allow only your pet to enter