Saturn V Third Stage Engine Purge Pump Control Module, measuring 6" x 4.5" x 4.25", with a George C. Marshall Spaceflight Center label on the main cylinder, reading: "Module, Control, Engine Pump Purge, Assy. No. 11439-5, DAC Spec. 1A58347-507, Contr. No. NAS 7-101…Ser No. 061, Date 9-8-66." Marked on the mount with numbers: "1B56804-1B, S/N015." This control module was part of a system on the Saturn V Third Stage that cleared residual propellant from the J2 engine injector and its feed lines (with helium gas) following engine shutdown.
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