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Cat flaps allow your pet to go inside and out whenever they want without needing to let them in or out. They can also help prevent your cat from peeing in the house. Fitting a cat flap in a door panel made of Upvc is much simpler than installing one in a glass door, but it requires some knowledge and the appropriate tools. Measure the Door Fitting a cat door in a front door can be difficult, but provided that the cat flap is the correct one and you follow the directions it shouldn't be too difficult. We