Look straight up inside the tail unit at the center unit's aft
LOX bulkhead; this is counter-clockwise from the overall LOX bulkhead photo. The rusty support
pole is at top.
Visible on the LOX bulkhead are the flanges for the
LOX fill/drain line (left) and LOX vent.
Aft of the bulkhead flanges, on the center unit wall, are two round fittings
with the square plates; the corresponding valves would have been mounted here
and would have been accessible on the exterior of the
The white arc is the opening
between the center unit and the tail unit, allowing sunlight into the
otherwise-dark tail unit; some of the connecting
fittings are visible on this white ring, as are two of the four steel pads
to which the engine
mount was bolted (at the 8:00 [partially out-of-frame] and 5:00