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dsca5854.jpg

Detail of the top of the fuel additive blender unit. The black label reads

—Push—
Full when Flush or Protruding

There appear to have been several FABU design iterations; one, like this particular FABU, had the full indicator on the raised center area, while others had the full indicator closer to the edge.

 
H-1 Engine (Davidson Center) at U.S. Space and Rocket Center
Time picture taken Sun Sep 14 13:11:32 2014
Location picture taken Saturn V Hall
Davidson Center for Space Exploration
U.S. Space & Rocket Center
Huntsville, AL
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