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It is easier than you think to put a cat flap in the solid uPVC panel or sealed double glazed unit. However, if you don't have the right tools or experience you will need to employ a professional. Learn how to measure, mark and cut the area of the uPVC panel to make your cat flap. Also, how to make it draft and weather resistant. Safety A upvc panel with an enclosed flap for cats is a great way to keep your pet secure and still allow your pet to move around freely. These panels are constructed from recycled materials, and require little maintenance.