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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 however the best choice is to buy a new pane of glass with an already-made hole. Follow the directions included in your kit. Make sure that the template drawing accurately represents the shape (circle or square). Safety If you have a cat or dog and would like to let them into the garden without opening the door A microchip activated pet flap in your d