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Overall walk-around of the Block I Saturn I.

Picture 12 of 12.

Referring to the SA-D's orientation, fuel tank 2 and LOX tank 3 are at center, with LOX tank 2 to the left and fuel tank 3 at right.

Note the 4-inch LOX relief valve on the forward skirt of L2 and the 7-inch LOX vent on the forward skirt of L3.