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A through wall cat flap is a great method to let your pet come and go as they please. Be sure not to put it too high into the wall. This could result in energy loss and also the possibility of burglars breaking 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 alternative. Easy to install A through wall cat flap is a great method to let your cat leave and come back whenever