... 2.Grade: J55,K55,N80,L80,P110 3.Thread:EUE,NUE api 2 3 8 j55 k55 tubing coupling-------------------------------------------------------------------------------SpecificationAPI Tubing CouplingSize ... Weight (kg)Tubing Coupling2-3/8”NUE73.02*107.951.282-3/8”EUE77.80*123.821.552-7/8”NUE88.90*130.182. ... Tubing coupling from 1.9” to 4-1/2”, Casing coupling from 4-1/2” to 13-3/8”TYPE: NUE, EUE (tubing coupling ...