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A cat flap that is through the wall is a great way to let your pets move around whenever they want. Be careful to not install it too high in the wall. This can lead to energy loss and also the possibility of burglars gaining access to your home. A cavity with a hole can be a challenge for future owners should you decide to sell your house. Glass cat doors are an alternative that is safer. Easy to install A through-wall cat flap allows your cat to come or go when it wants.