It connect with sucker rod, the centralizer casing OD is larger
than the sucker rod coupling OD in order to centralizer rod.
Centralizer casing has high strength wear resistant, so when
contact with oil tube, makes the centralizer body wearing and
reduces oil tube wearing so as to anti-wear (centralizer casing
temperature resistant: 260°C, material: self-lubricating Ni-p
plating material). The steel surface adopt Ni-p plating (the
anti-corrosion technology) makes the centralizer has the ability of
anti-wear and anti-corrosion. And it also suitable for the worse
corrosion well condition.