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Overall view, from left to right, of the turbopump fuel inlet elbow, turbine, heat exchanger, and turbine exhaust manifold inlet.

Hot gas from the gas generator flows through the turbine, powering the turbopumps. Just aft of the turbine is the heat exchanger, which heats helium and oxygen to pressurize the fuel and LOX tanks, respectively. The gas is exhausted through the turbine exhaust manifold, where it is ultimately used to provide film cooling for the nozzle extension.