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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 best alternative is to install the glass pane from scratch using a hole that is already made. Take note of the instructions that will be included with your cat flap kit and follow them carefully. Make sure that the template drawing accurately represents the shape (circle or square). Safety If you have a dog or cat and want to let them in the garden without leaving the door open A microchip activated pet f