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A cat flap that runs through the wall allows your pet to go out and in as they please. Be sure not to install it too high in the wall. This can lead to energy loss and the possibility of burglars gaining access to your home. If you are planning to sell your house in the near future, having a hole in a cavity wall can be an issue for new owners. Glass cat doors are a safer option. Easy to install A cat flap that is built into the wall is