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It is possible to install an apron flap inside the upvc panel, or even a double glazing sealed unit. However, the best alternative is to install an entirely new glass pane that has an already-made hole. Take note of the instructions that will be included with the kit for cat flaps, and follow them carefully. Ensure that the shape drawn (be it a square or circle) is accurately represented on the template. Safety A microchip activated pet door in your upvc door is a fantastic option if you have a dog or cat and wish to let them out in the garde