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Detail of the forward skirt of LOX tank 3, with its 7-inch LOX vent.

Picture 2 of 2.

This picture is exposed for the inside of the LOX vent.

Forward of L3, note the green triplex spheres (containing nitrogen to pressurize the fuel tanks), the end of the spider beam to the right of L3, and how the lines connecting the spheres pass through holes in the spider beam. Also note the instrumentation canister above the spider beam.

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.