R-4D Reaction Control Engine purge plug, measuring 15" long, with the metal parts bearing stamped and stenciled part numbers, and a hard rubber collar at the bottom of the flexible base; the cylinder is packaged and tape-sealed, and the handle bears a portion of the original "Space Division North American Rockwell" tag marked "M761686." The R-4D and this type of purge plug were used on the Apollo Service Module and the Lunar Module. In fine condition, with scattered light wear.
