Abstract: A lubricator for a plunger lift system includes a tubular body, a shift rod housing, a first spring, and a second spring. The shift rod housing disposed in the tubular body and has a chamber. The shift rod has a first portion slidably disposed in the chamber and a second portion projecting from a first end of the shift rod housing. A distal end of the second portion of the shift rod is engageable with a shift valve of a bypass plunger. The first spring disposed in the chamber to absorb an impact force applied to the shift rod by the shift valve. The second spring disposed in the tubular body between a portion of the shift rod housing and a portion of the tubular body to absorb an impact force applied to the shift rod housing by a plunger body of the bypass plunger.

Abstract: A fishing neck for a plunger comprises a head portion, a neck portion, a lower portion, and a plurality of ribs. The head portion has a cylindrical configuration with an outer peripheral surface and an outer diameter. The neck portion also has a cylindrical configuration with an outer peripheral surface and an outer diameter, but the outer diameter is less than the outer diameter of the head portion. The neck portion extends from the head portion. The lower portion extends from the neck portion, which is opposite the head portion, and is connectable to a plunger. The lower portion has an outer diameter greater than the outer diameter of the neck portion. A plurality of ribs projects from the outer peripheral surface of the neck portion and extends helically from the head portion to the lower portion.