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It is possible to install a cat flap into a upvc panel or a double glazing sealed unit. However, the most effective alternative is to install a new glass pane with a hole that is already made. Follow the instructions provided with the kit. Make sure that the illustration accurately depicts the shape (circle or square). Safety If you have a dog or cat and would like to allow them access to the garden without leaving the door open, a microchip activated pet flap