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It is possible to put the cat flap inside the door panel made of upvc or double glazing glass sealed units however the best choice is to purchase a brand new glass pane that has a premade hole installed. Follow the directions that should be included with the kit for cat flaps, and follow them with care. Make sure that the template sketch accurately depicts the shape (circle or square). Safety If you have a dog or cat and would like to let them into the garden without opening the door A microchip activated pet flap in your door p