A fire extinguisher was a tool that sprayed white foam or gas with the ability to put out fires.
During the Battle of Sullust of the Clone Wars, R2-D2 utilised his built-in fire extinguisher to rescue Jedi General Obi-Wan Kenobi and his astromech droid R4-P17 by spraying its contents over their scorched starfighter.
After escaping from the first Death Star in 0 BBY, R2-D2 made use of the tool to put out a small fire that was started on the Millennium Falcon after it took several hits from pursuing TIE fighters. In 3 ABY, he again made use of his built-in extinguisher while on Cloud City. This time it was used as a smokescreen to blind the stormtroopers that were chasing them.
In LEGO Star Wars: Revenge of the Sith, after losing his duel with his former master, Obi-Wan Kenobi on Mustafar, Darth Vader, saddened, sat too close to lava and caught his pants on fire. However, Emperor Sheev Palpatine arrived just in time to save him by putting out the fire with a fire extinguisher, stating that he liked his Sith Lords on the dark side, not burned to a crisp. Despite this, Vader was forced to henceforth wear armor due to his burns.
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