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Detail into the second stage adapter, taken from approximately Pos. III, looking north toward Pos. II. Fuel tank 2 is at left, with LOX tank 3 at right. Note the 7-inch LOX vent on the forward skirt of L3.

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 L3.

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.