... as elbow,tee,cross,coupling,nipple,plug... Features for stainless steel female union : 1. It looks nice,reliable quality,strictly conforms to ASME ... B16.11,or MSS standard2. Size (1/8" ~4"), Metric (3mm ... ~50mm).3. ConnectionthreadNPT, BSP,PT-ISO 7/1), or butt-welding,socket welding connections.4. Material: A105, A182 ...