1.In addition to 24 inches oil pipeline interfaceand 20 inches, 24 inches, 30 inches. 2.But according ... need to customize. 1.In addition to 24 inches oil pipeline interfaceand 20 inches, 24 inches, 30 inches. 2.Use, used ... other characteristics, widely used in petroleum pipeline connection. 3.Process: forging, rough machining, heat treatment, inspection, finishing. 4.Customers can according to ...