A99 aquata breather/Legends

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. Jedi Knights commonly carried aquata breathers during field operations.

Characteristics
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 Master Plo Koon, supplied not only Dorin gases but also protected the wearer's face from the harsh effects of oxygen.

History
Jedi Qui-Gon Jinn and Obi-Wan Kenobi used aquata breathers when traveling to the underwater city of Otoh Gunga on Naboo.

Obi-Wan would use the same A99 over a decade later, after he and Boga fell into a sinkhole abyss on the remote planet of Utapau, trying to escape Palpatine's newly unleashed Order 66.

Behind the scenes
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.

Appearances

 * Episode I Adventures 1: Search for the Lost Jedi
 * Episode I Adventures 2: The Bartokk Assassins
 * Darth Maul: Shadow Hunter
 * Star Wars Episode I: The Phantom Menace novel
 * Star Wars Episode I: The Phantom Menace
 * Star Wars Episode I: The Phantom Menace junior novel
 * Jedi Apprentice Special Edition: The Followers
 * Jedi Quest: The False Peace
 * Jedi Quest: The Final Showdown
 * Republic Commando: True Colors
 * Changing Seasons
 * Secrets of the Jedi
 * Creature Comfort
 * Labyrinth of Evil
 * Star Wars Episode III: Revenge of the Sith
 * The Last of the Jedi: The Desperate Mission
 * The Last of the Jedi: Death on Naboo
 * The Last of the Jedi: The Desperate Mission
 * The Last of the Jedi: Death on Naboo