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A cat flap that runs through the wall allows your pet to go in and out as they please. Be careful not to install it too high into the wall. This could result in energy loss and burglars to enter your home. A cavity with a hole could be a problem for future owners if you plan to sell your home. Glass cat doors are a much safer option. Easy to install A cat flap that is built into the wall allows your cat to come and go when it wants. It's easy to put up and there are a variety of models to choos