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It is possible to install the cat flap inside a door panel made of upvc, or a double glazing glass sealed unit, although the best option is to have a new pane of glass with an already-made hole. Read the instructions that should be provided with your cat flap kit and follow them with care. Make sure that the sketch accurately depicts the shape (circle or square). Safety If you have a cat or dog and would like to let them into the garden without leaving the door open, a microchip-activated pet flap inside your upvc door panel is a great choice. It will only allow