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dsca5854.jpg

Detail of the forward end 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 & 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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