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It is possible to put an animal flap into the door panel made of upvc or double glazing glass sealed unit but the best solution is to have a new glass pane that has a premade hole installed. Take note of the instructions that will be included in the kit for cat flaps, and follow them carefully. Make sure that the shape you have drawn (be it a square or circle) is accurately depicted on your template drawing. Safety If you have a cat or dog and would like to allow them access to the garden without ope