The Browning On-Off Tool is the original automatic latching On-Off tool.  This versatile tool can save producers time and money and has continuously been improved to provide the longest run time in the field before requiring replacement.  The primary use is with over-sized tubing pumps where the plunger diameter is larger than the tubing drift diameter, but it has been adapted for use in wells where the sucker rod insert pump is prone to being stuck in the seating nipple. 

For wells with paraffin issues, the rods can be pulled to scrape paraffin from the tubing, then automatically latch the rod string on the pump and get back to production.

For wells prone to sucker rod breaks, the rods can be fished without unseating the pump, greatly reducing the time to get the well back on production.

The tool should be sized for the pump bore rather than the tubing drift diameter.