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It is possible to fit the cat flap inside 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 an already-made hole. Follow the instructions provided with the kit. Make sure that the template sketch accurately depicts the shape (circle or square). Safety If you have a dog or cat and would like to let them in the garden without having the door open, a microchip activated pet flap in your door panel made of upvc is a great option. It will allow y