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The LOX supply port on the heat exchanger.

Internally, the heat exchanger had four oxygen coils through which the LOX passed, evaporating and expanding into gaseous oxygen (GOX) in the still-warm turbine exhaust gases, so there are four externally-visible tube inlets within the LOX supply port.

Note the orifice plates on the four tube inlets, which controlled the amount of LOX admitted to the heat exchanger (and thus determined the amount of GOX pressurant produced). The orifice plates were calibrated for each engine and bore the engine's serial number. The lower-left plate reads "F 2003" and the other three read "2003".

The text below the flange at the 6:00 position reads "LO2 In".

 
Liquid oxygen (LO2) inlet port on heat exchanger on F-1 Engine at Kansas Cosmosphere
Time picture taken Thu Dec 5 16:31:54 2013
Location picture taken South of Museum
Kansas Cosmosphere
Hutchinson, KS
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