Bluestar International supplies Female Stud Elbow Fitting. Bluestar International is an ISO 9001: 2000 and ISO 14001:2004 recognised company manufacturing a wide range of instrumentation tube fittings, valve fittings, flanges and piping products. The Female Stud Elbow Fitting is available in overall tube diameter ranging from 1/8 inch to 1 inch and comes in a variety of specifications to suit application in instrumentation and process control system tubing, double ferrule compression tube fittings and tubing lines.