The long plunger anti-stick pump use the structure of long plunger, short barrel, lateral intake and ring-space sand setting, which make the sand can sink into the tail pipe along the ring-space. 

Product Features:

Good match between long plunger and short barrel to stop sand scale enter the working face and prevent pump stick.
The structure of lateral oil hole and grit scale space to avoid sand buried scale fixed valve
Easy to operate and maintain
Should not be used in the gas well.