SUCKER RODS, POLISHED RODS, COUPLINGS[Apr. 26, 2011 5:35:14]
Specification
UPCO Inc, - produces API certified sucker rods, pony rods, sinker bars
And Couplings
HASCO Manufacturing – offer polished rods, polished rod liners,
Shock absorbers / lubricator / wipers, gas anchors and plungers
Oilfield Improvemen – has a line of sucker rod guides rod guides & wheeled rod guides