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It is possible to insert an apron flap inside an upvc panel or double glazing sealed unit. However, the best option would be to install an entirely new glass pane that has a pre-made hole. Take note of the instructions that will be included in your cat flap kit, and follow them with care. Ensure that the shape drawn (be it a square or circle) is accurately drawn on your template drawing. Safety If you have a cat or dog and would like to allow them access to the garden without opening the