This coupler was used for supplying liquid Oxygen to the Apollo Fuel Cell storage tanks. Subcontracted by North American Aviation (builder of the CSM) to Fairchild Hiller Corporation under NASA Contract NAS9-150 (CSM).
Cryogenic Hydrogen and Oxygen comprised the constituent reactants used by the onboard Fuel cells to provide power, drinking water and heating. The Oxygen tanks also supplied metabolic breathing oxygen to the crew.
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