1.Name: tubing couplings 2.Std Ref: API 5CT 3.Grade: J55,K55,N80,L80,C90,P110,N80 ... Descriptiongsand sizeType of TreadO.D*L(mm)Weight(kg)API 5CT EUE tubing couplings2-3/8"NUE73.02*107.951. ... API couplings for oil tubing and casing.4. Grade:J55,K55,N80,L80,C90,P110,N80-1,N80-Q5. Size:tubing coupling ... .9"to 4-12"6. Type:NU,EU(tubing coupling)7. We also supply the products what customer request8. ...