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It is possible to install an apron flap inside an upvc panel or double glazing sealed unit. However, the most effective alternative is to install an entirely new glass pane that has a hole that is already made. Take note of the instructions that will be included with your cat flap kit, and follow them with care. Make sure 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 inside your door's up