... 3/8'' 2 7/8'' 3 1/2'' 3.J55 K55 N80-1 N80-Q 4.seamless and electric-welding ... ’’2 3/8’’2 7/8’’3 1/2’’Antiseptic tubing,Reverse thread tubing,Various pupjoint and Small drill pipe,etcmm60. ... beam pumping units, subsurface sucker rod pump, sucker rod, tubing, casing, super high press choke line and kill line ... well equipment and charismas tree,mud manifold, etc. 3 1/2'' j55 API 5CT seamless tubing &pipe