AMTECH OFFERES Hex Nipple, Hex Plug, Cap, Bushing,Unions , with End Type : Threaded (NPT/ BSP), Socket Weld,Material : MS, ASTM A105, SS 304 / 316,Pressure : 150 lbs to 6000 lbs,Size : ½ Inch to 4 Inch.Operation : Precision Dimension Control and superior gauge control by threading with CNC Lathes