This Anderson Metals 56122 hex nipple is a brass pipe fitting with 3/8″ male NPT threads. The hex nipple fitting is a short length of pipe with threaded ends for connecting threaded pipes, and it has a hexagonal section in the middle for an increased bearing surface when adjusting the fitting with a wrench. It has male National Pipe Taper (NPT) threads for connecting to female threaded pipes, creating a tighter seal than straight threads. This fitting is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. Brass can be connected to copper, brass, plastic, aluminum, and welded steel. The fitting has an operating temperature range of -65 to +250 degrees F. This fitting meets American Society for Testing and Materials (ASTM) B584 and American Society of Mechanical Engineers (ASME)/American National Standards Institute (ANSI) B16 specifications for quality assurance. Pipe fittings are 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.