Apollo service module fuel cell. Three cells were used to generate power for the spacecraft and water for the astronauts.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...l_fullsize.jpg
Previously:
NASA KRUSTY nuclear reactor - photo
Lunar Rover trainer - photo
Apollo astronaut survivalist kit and training - photos
Astronaut Buzz Aldrin punching moon conspiracy theorist in face GIF
Redesigned NASA door after Apollo 1 fire - GIF
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