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View of the lines leading to the engine's heat exchanger.

Picture 1 of 3.

From right to left, the lines are

• Helium supply line
• LOX supply line
• Helium return line
• GOX return line

Note that each supply line is of a smaller diameter than the corresponding return line. Also note that each pair of supply/return lines are joined by a bypass hose.

Under the fitting terminating each line is the actual entrance to the heat exchanger coils.