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It is simpler than you think to put the cat flap on a solid uPVC panel or sealed double glazed unit. If you don't have the appropriate equipment or know-how, you'll require the help of professionals. Learn how to measure and mark the area of the uPVC panel for your cat flap. Also, learn how to make the flap weatherproof and draft-proof. Safety A upvc panel that has a cat flap is a great option to keep your pet secure while still allowing the pet to move around freely. These panels are made from recycled materials and require little maintenanc