Abstract: A pump plunger for a sucker rod pump includes an elongated plunger body having first and second plunger body ends and a longitudinal plunger body bore extending between the first and second plunger body ends, a first plunger end fitting releasably carried by the first plunger body end of the plunger body, a second plunger end fitting releasably carried by the second plunger body end of the plunger body, a first plunger seal pack sandwiched between the first plunger body end and the first plunger end fitting and a second plunger seal pack sandwiched between the second plunger body end and the second plunger end fitting.

Abstract: A pump plunger for a sucker rod pump includes an elongated plunger body having first and second plunger body ends and a longitudinal plunger body bore extending between the first and second plunger body ends, a first plunger end fitting releasably carried by the first plunger body end of the plunger body, a second plunger end fitting releasably carried by the second plunger body end of the plunger body, a first plunger seal pack sandwiched between the first plunger body end and the first plunger end fitting and a second plunger seal pack sandwiched between the second plunger body end and the second plunger end fitting.

Abstract: A collapsible-reusable-returnable-recyclable die cut, self locking corrugated carton is disclosed. An embodiment includes a plurality of side panels attached to each other by way of corrugated folding lines, and a plurality of bottom panels attached to respective side panels by way of another set of corrugated folding lines. In the unfolded state, the side and bottom panels are adapted to lie substantially on the same plane. In the folded state, the side panels area adapted to form sides of the carton, the bottom panels are adapted to form a bottom of the carton, and at least a pair of the bottom panels are adapted to interlock. Any one or more of the panels may include thereon advertisement indicia. Additionally, any one or more of the side panels may include hand holes to facilitate the handling of the carton.