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The LOX feed line emerging from the stage's thrust structure, a gap, and the J-2 engine's LOX inlet (visible in this overall engine shot).

Note that the LOX feed line fails to reach a support fitting on the thrust structure. I don't have any photos of this side of the stage from prior to the stage's restoration, but do see that the LOX feed line was in a similar position six months after restoration on the stage began.

For a time the museum's Skylab mockup had a LOX feed line and J-2 LOX inlet duct.