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A through wall cat flap is a great way to allow your pets to leave and come whenever they want. However, you must be cautious not to put it too high on the wall. This can lead to energy loss and also the possibility of burglars gaining access to your home. Also, if you are planning to sell your house in the near future, having a hole in a cavity wall can be an issue for prospective buyers. Cat doors made of glass are the security of glass. Easy to install A through wall ca