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View of the lines leading between the heat exchanger and the forward end of the engine.

Picture 2 of 6.

One line, the LOX supply line, comes from the LOX dome, runs closer to the thrust chamber (behind the turbopump outrigger), and is mostly obscured in this view (although part of the LOX flowmeter is visible to the right of the No. 2 fuel high-pressure duct, between the two top heat exchanger lines).

The three other lines run parallel to each other toward the forward end of the engine. From top to bottom, these three are the GOX return line, the helium return line, and the helium supply line.