... and sizeType of ThreadO.D*L(mm)Weight(kg)Tubing Coupling2-3/8"NUE73.02*107.951.282- ... supply permium thread products by customer's request3.Size: tubing coupling from 1.9" to 4-1/2", ... 2"to 13-3/8"4.Type: NU, EU(tubing coupling), STC,LC,BTC(casing coupling). 5.Surface treatment ... of customers Our company manufacture and sell casing and tubing couplings,pup joints, tool joints, adapter pup-joints, ...