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Overall walk-around of the hydrogen exit manifold.

Picture 1 of 3.

After passing through the regenerative cooling tubes, the hydrogen (by now a gas) exits the tubes at the forward end of the thrust chamber and is returned to this manifold, where it is then routed to the turbine to drive the turbopump.

Note how there is a chamber at the forward end of the tubes, from where the hydrogen enters the larger, circular manifold.