... well tubing 1.standard:API 5CT 2.Certification:SGS 3.material:N80/L80/K55/J55/P110/t95 4.Fast delivery oil well tubing ... 's requirementCoupling and thread BTC,LTC,STC. Tubing (NUE,EUE)surface treatment FBE,PE,VARNISHCertificationISO , API, Mill Test CertificateMain marketUSA, Canada, Turkey ...