The A99 aquata breather was a small breathing apparatus that allowed oxygen-breathing lifeforms to survive underwater, in space, or among noxious gas for up to two hours.[1]Jedi Knights commonly carried aquata breathers during field operations.
The device utilized filtering mechanisms to separate external gaseous mixtures and relied on miniature tanks of compressed oxygen to provide breathable gas. These were generally used underwater or in other hazardous environments. They typically weighed 0.2 kgs. and cost 350 credits.
The A99 model had a number of different variants customized for use by alien species; often supplying not oxygen but an equally important gas. The antiox variant, commonly used by Kel Dor such as Jedi MasterPlo Koon, supplied not only Dorin gases but also protected the wearer's face from the harsh effects of oxygen.
According to Hasbro, Obi-Wan Kenobi kept an A99 aquata breather in a chest in his hut on Tatooine, nonwithstanding the lack of water on the desert planet.