Saturn V third stage S-4B hydraulic pump used as engineering test hardware, measuring approximately 11″ x 7″ x 18.5″, with a NASA George C. Marshall Space Flight Center tag on the side, reading: "Hydraulic Motorpump, 50-60 VDC, 0-1.5 GPM, 3650 PSIG, DAC Spec. 1A66241-509, Assy No. EA1565-530-9, Contr No. NAS7-101, Ser No. X454598, Mod No. DSV-4B, Date 3Q 65." The valves and caps at the top bear additional tags and part numbers, and the body is stenciled, "Eng. Test Hardware." Hydraulics were utilized to gimbal the S-IVB J-2 Rocket Engine. In fine condition.
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