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Overall walk-around of the Service Propulsion System (SPS) engine.

Picture 5 of 6.

Note the fuel service connector (used to fill and drain the Service Module's SPS engine fuel tanks) at the top of this picture.

I've prepared a page diagramming the Service Module's aft face, featuring the aft heatshield and some of the Service Propulsion System (SPS) plumbing, including the propellant fill/drain connectors.