vis npt bushing, reducer/reducing hex brass pipe fitting, 1/4" npt male to 1/8" npt female (pack of 5) vis this hex bushing is components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. when purchasing pipe fittings, consider the application, as this will affect material type, shape, size, and required durability. fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).