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It is possible to put the cat flap onto the upvc panel, or even a double glazing sealed unit. However, the most effective alternative is to install the glass pane from scratch using a hole that is already made. Read the instructions that should be provided with your cat flap kit, and follow them with care. Make sure that the template illustration accurately depicts the shape (circle or square). Safety If you have a cat or dog and want to let them in the garden without opening the door, a microchip activated pet flap inside your door panel made of upvc is a great