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It is possible to install the cat flap inside a upvc door panel or double glazing glass sealed unit, although the best option is to buy a new pane of glass with a premade hole installed. Read the instructions that should be included in your cat flap kit and follow them with care. Make sure the sketch accurately depicts the shape (circle or square). Safety If you have a cat or dog and want to let them in the garden without having the door open, a microchip activated pet flap in your door