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Overall view of the second stage adapter, taken from approximately Pos. IV (LOX tank 4 and fuel tank 4 are at center on the bottom; note the GOX line running up F4's left side). Also note the fuel vent on the forward skirt of F3 at left.

Picture 2 of 2.

This picture is exposed for the interior of the second stage adapter area. Note the green triplex spheres (containing nitrogen to pressurize the fuel tanks), the ends of the spider beam between the propellant tanks, and how the lines connecting the spheres pass through holes in the spider beam. Also note the instrumentation canister forward of F3.

The wire running up from F4 to the second stage adapter is presumably the stage's lightning rod grounding wire.

The screen installed over the opening between the S-I stage and its adapter is presumably to keep the birds out; I don't believe that it was original equipment.