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It is easier than you think to install a cat flap in a solid uPVC panel or sealed double-glazed unit. If you don't have the proper tools or experience you will need to employ an expert. This guide will teach you how to mark the, measure and cut the cat flap on the uPVC panel. Also, how to make it weather and draft resistant. Safety A upvc door panel with cat flap is an excellent option to ensure your pet's safety while allowing them to move freely. These panels are made from recycled materials and require very m