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It is easier than you think to put an animal flap inside a solid uPVC panel or a sealed double-glazed unit. If you don't have the right tools or have no experience, you'll need an expert. Follow this guide to learn how to measure and mark the area of the uPVC panel to make your cat flap. Also, how to make the flap weatherproof and draft-proof. Safety A upvc door with cat flap is an excellent way to ensure your pet's security while allowing them freedom of movement. These panels are made from recycled