9-5/8'' Casing Coupling/K55 or J55/API 5CT 1.Standard:API 5CT ,5B 2.Size:2-3/-20" 3.Grade: k55,j55, ... , the largest port in north of China. With API 5CT oil casing and API 5L oil line pipe,as the main products,with production and sales integration ... operations, strength financial , rich experience.9-5/8'' Casing Coupling/K55 or J55/API 5CT Quality is our main competitive advantage• The requirements ...