13 3/8" btc casing coupling 1.Grade: J55, ... STC,LTC 3.Standard: API 4.Place of Origin: China 13 3/8" btc casing coupling -----------------------------------------------------------------------------------------------------------FeaturesGRADE: J55, K55, ... 4-1/2”, Casing coupling from 4-1/2” to 13-3/8”TYPE: NUE, EUE (tubing coupling), STC, ... .12*269.8831.77 API casing Coupling 13 3/8" btc casing coupling