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https://writeablog.net/juryqua....il09/replacement-upv
It's easier than you think to install the cat flap on the solid uPVC panel or sealed double glazed unit. If you don't have the proper tools or no experience, you'll need a professional. This guide will teach you how to mark the, measure and cut the cat flap area of the uPVC panel. Also, how to make the flap weather and draft resistant. Safety A upvc panel with the flap for cats is a great way to ensure your pet's security and still allow the pet to move around freely