Close-up of various components on the top of the engine (as it rests in the
- To the upper right is the back of the engine 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 two
bottom-most lines leading into it (leading to the two left-most connectors)
are the helium (bottom-most) and oxygen supply lines; the two upper,
larger-diameter lines leading away from the heat exchanger are the helium
and oxygen return lines (it's hard to tell for certain from the pictures I
took, but it appears that top/right-most line is the oxygen return and the
one just below/to the left is the helium return).