High strength API 11B standard high quality sucker rod coupling with T Casing centralizer is mainly used for centralizing of the well which needs 4"casing because of the deformation of 5 l/2"casing and sidetracking well. Casing centralizer is mainly composed of main body, slip centralizer bush, piston and self-blocking mechanism and so on. It is simple structure, flexible piston and good tightness. Small OD makes it is not easy to be blocked
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