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It is possible to put the cat flap inside a upvc door panel or double glazing glass sealed units however the best choice is to purchase a brand new glass pane that has an already-made hole. Follow the directions that came with the kit. Make sure that the template sketch accurately depicts the shape (circle or square). Safety A microchip-activated pet panel inside your door made of upvc is a great solution if you have a dog or cat and would like to let them out into the garden, but don't want to leave the door open. This will only allow your pet to go in while pre