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A cat flap that is through the wall is a great way to let your pets come and go whenever they like. Be sure to not install it too high in the wall. This could lead to energy loss and the possibility of burglars breaking into your home. A hole in a cavity could be a problem for future owners if you plan to sell your home. Glass cat doors are a safer choice. Easy to install A through-wall cat flap allows your cat to come and go whenever it wants.