A tool for use in suspending operation of an oil or gas well driven by an artificial lift with a polished rod connected to a sucker rod in a tubing string. The tool includes a body having a lower narrow portion dimensioned to fit within the interior cavity of a tubing string inlet or an upper extension thereof, and an upper wide diameter portion defining a substantially horizontal landing surface dimensioned to rest upon the top edge of the tubing string inlet or the upper extension thereof. The tool includes one or more sucker rod-engaging structures and one or more longitudinal slots extending through the lower narrow portion and the upper wide diameter portion to allow passage of fluid or gas through the tool when the tool is supported on the top edge of the tubing string inlet or the upper extension thereof.