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A through-wall cat flap allows your pet to go in and out whenever they like. You must be careful not to install it too high in the wall. This could result in energy loss and allow burglars to enter your home. Also, if you are planning to sell your house in the near future having a hole in a cavity wall could be an issue for new owners. Glass cat doors are a safer choice. Easy to install A through-wall cat flap allows your cat to come and go as it pleas