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It is possible to put an animal flap into a upvc door panel or double glazing glass sealed units but the best solution is to purchase a brand new glass pane with a premade hole installed. Take note of the instructions that will be provided with your cat flap kit, and follow them with care. Make sure that the drawing accurately represents the shape (circle or square). Safety If you have a dog or cat and want to let them into the garden without leaving the door open A microchip activated pet flap on your doo