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dsc59701.jpg

Detail of the No. 1 tube marking.

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 between throat straps on F-1 Engine (Outdoors) at U.S. Space & Rocket Center
Time picture taken Fri Feb 20 11:50:36 2009
Location picture taken Rocket Park
U.S. Space & Rocket Center
Huntsville, AL
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