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is possible to insert an apron flap inside an upvc panel or double glazing sealed unit. However, the best solution is to put in a new glass pane with an already-made hole. Follow the directions that came with the kit. Make sure that the template drawing accurately represents the shape (circle or square). Safety If you have a cat or dog and want to allow them access to the garden without having the door open, a microchip activated pet flap in your door panel made of upvc is a great choice. It will allow only your pet to go i