https://jsfiddle.net/dahliabite4/Ltndejym/
It is possible to put an apron flap inside a upvc panel or a double glazing sealed unit. However, the best alternative is to install an entirely new glass pane that has a pre-made hole. Read the instructions that should be included in your cat flap kit, and follow them with care. Make sure that the template drawing accurately represents the shape (circle or square). Safety If you have a cat or dog and would like to let them into the garden without leaving the door open, a microchip activated pet flap inside your upvc door panel is a fantastic
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