https://mccormick-santiago.hub....stack.net/cat-flap-i
https://mygind-camacho-3.techn....etbloggers.de/upvc-d
It is possible to insert an apron flap inside an upvc panel or double glazing sealed unit. However, the most effective solution is to put in a new glass pane with a pre-made hole. Follow the directions that should be provided with the kit for cat flaps, and follow them carefully. Make sure that the shape you have drawn (be it circle or square) is accurately represented on your template d