... , three different-diameter pipe(size head),insulation joints, insulating flange and forging system for plug-ins, threaded pipe fittings and high pressure, such as ... various types of pipe fittings, can be GB,HG,JB,SY,HGJ,SH,ASME,ANSI,APL ... with customers from over the world. Hoping for your inquire. high quality carbon steel hex threaded pipe plug