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It is possible to insert the cat flap onto a upvc panel or a double glazing sealed unit. The best solution is to put in the glass pane from scratch using a pre-made hole. Read the instructions that should be included with your cat flap kit, and follow them closely. Make sure the drawing accurately represents the shape (circle or square). Safety A microchip activated pet door in your door made of upvc is a great solution if you have a dog or cat and wish to let them out into the garden, but don't want to open