Protective cover assembly for a 1966 Rocketdyne F-1 engine high pressure oxidizer duct, measuring 14.25″ x 3″ x 5″, with left housing marked “Install Four (4) ½ Unit Bags Desiccant,” with Rocketdyne part numbers: “ST39500393RK011” and “02602 MFR 60539.” The duct features a hexagonal plug, is marked in white stencil, “Down Stream Side,” and terminates with a metal plate bearing Rocketdyne part numbers: "Assy of ST39500391RK001, MFR 60539.” Includes its large "Non-operational Hardware" tag. In fine condition.