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It is possible to install the cat flap inside the door panel made of upvc or double glazing glass sealed unit but the best solution is to buy a new glass pane with an already-made hole. Take note of the instructions that will be provided with the kit for cat flaps, and follow them closely. Make sure the sketch accurately depicts the shape (circle or square). Safety If you have a dog or cat and want to allow them access to the garden without having the door open A microchip activated pet flap inside your do