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A breathing tube or breathing device, as the name suggests, was a structure which was designed to assist with respiration. These were often used by species who were living or working among other beings with different environmental requirements for breathing mixtures.
Barzans had to wear breathing devices when they leave their homeworld Barzan II, the device provided them with the gases that were found in the atmosphere of their homeworld and that were toxic to other species. (TNG: "The Price")