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Close-up of a burner cup.

Fuel, delivered from the turbopump, enters the area between the two walls comprising the thrust chamber at the six alcohol inlets near the thrust chamber's exit plane. The fuel flows forward, providing regenerative cooling, through the main fuel valve, and to these burner cups, flowing through the fuel injector nozzles, where the fuel is mixed with atomized oxygen and burned.

At forward-center of the burner cup is the oxygen atomizer.