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dsc85095.jpg

Detail of the No. 1 tube marking, partially obscured by the LOX drain line.

The No. 1 tube is a "fuel-up" tube, with an arrow indicating the direction of flow (i.e., up, or toward the throat).

 
No. 1 tube marking on F-1 Engine (Building 4200) at Marshall Space Flight Center
Time picture taken Thu Jul 19 15:35:28 2012
Location picture taken Building 4200
Marshall Space Flight Center
Huntsville, AL
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