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A cat flap that runs through the wall allows your pet to go in and out whenever they want. However, you must be cautious not to put it too high on the wall. This could result in energy loss and the possibility of burglars gaining access to 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 an alternative that is safer. Easy to install A wall-to-wall cat flap lets your cat to come or go whenever it wants. It's easy to put up and there are a variety of models to choose from