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View into the second stage adapter.

Behind the adapter is a view similar to Section-AA of the Block I S-I profile. Visible, from left to right, are fuel tank no. 4 (F-4), LOX tank no. 1 (called either L-1 or O-1 -- the "O" being for oxidizer), and tank F-1.

Forward of the propellant tanks are some nitrogen spheres from the fuel pressurization system.

Also visible above O-1 and going through the skirt of F-1 is the fuel pressurization manifold.