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Close-up of various components on the top of the engine (as it rests in the museum):

• To the upper right is the back of the engine's interface panel.
• The large-diameter pipe under that (bending away from the camera) is the No. 2 oxidizer high-pressure duct; a bit of the No. 2 oxidizer valve is visible at the bottom of the photo.
• The large-diameter pipe bending toward the camera near the middle of the photo is the No. 2 fuel high-pressure duct.
• The heat exchanger occupies the upper left of the photo. The heat exchanger has four lines running to/from it, including (from top to bottom)
  • GOX return line
  • Helium return line
  • LOX supply line
  • Helium supply line