Transpirator

A transpirator was a device used as an assist for the respiratory system, similar in form and function to a breath mask. It was known to be used by members of the Muun species.

In 67 BBY, Darth Plagueis wore a transpirator mask to protect his respiratory system from the superheated air of the Bal'demnic grotto, where he and his master, Darth Tenebrous, who wore a similar mask, were inspecting cortosis deposits. After an attempt on his life by Maladian assassins 15 years later left Plagueis with a severed trachea and a large part of his jawbone missing, he was forced to wear a transpirator mask permanently until the end of his life. The device was affixed to the upper part of his chest and protected by an armored torso harness.

Text and facts from the “Transpirator/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.