Detail of the service module's oxidizer service
connection (used to fill and drain the service module's SPS engine
oxidizer tanks), as seen from the interior of the
Picture 1 of 2.
I've prepared a page
diagramming the Service Module's aft face, featuring the aft heat shield and
some of the Service Propulsion System (SPS) plumbing, including the propellant
For a view of the actual connector, see my picture set of CSM-119 at the Kennedy Space Center.