https://jsfiddle.net/musiccannon18/ecL7b5ad/
It is possible to insert a cat flap into a upvc panel or a double glazing sealed unit. However, the best solution is to put in a new glass pane with an already-made hole. Follow the directions that came with your kit. Make sure the shape you've drawn (be it a square or circle) is accurately represented on the template. Safety If you have a dog or cat and want to allow them access to the garden without leaving the door open, a microchip-activated pet flap on your door's upvc panel is a great choice. It will only allow your pet inside, while p