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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 SLA.

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 fill/drain connectors.

For a view of the actual connector, see my picture set of CSM-119 at the Kennedy Space Center.