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Overall walk-around of the aft face of the injector.

Picture 2 of 3.

Note the 15 rows of axially-drilled holes, corresponding to the 15 ring grooves supplying the oxidizer orifices in the forward face of the injector. Liquid oxygen from the LOX dome flows through these holes, supplying the oxidizer rings on the interior of the injector. See page 1-2 (page 4 in the PDF) of the supplement to F-1 Rocket Engine Technical Manual: Engine Data (R-3896-1) for additional information on these holes.