Type of connector:19,22,25mm rod conne Max O.D.:58,58,72mm Total length: ... 348,370mm Purpose:It is mainly used to right the rod in side-wearing well, especially in above-neutral point side ... relative lower cost and so on.When dropping the oil rod during operating, must slow down the speed in order to ... avoid scratching the surface on the joint between the rod and the well mouth. OIL ROD CENTRALIZER