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A through-wall cat flap allows your pet to go in and out as they please. However, you should be careful not to place it too high on the wall. This can cause the loss of energy and also allow burglars to break into your home. A hole in a cavity can be a challenge for future owners if you intend to sell your home. Glass cat doors are a safer choice. Easy to install A through wall cat flap is a great way to allow your cat to move around as it pleases. It's easy to put up and there are a variety of models to choose from. Certain models let you clos