Brass Pipe Fittings, 1/2 X 3/8 LP RED. HEX NIPPLE (Pack of 1). These reducing hex nipple pipe Fittingss are made of brass and has male National Pipe Taper (NPT) threaded connections. This reducing hex nipple Fittings has one end smaller than the other for connecting two threaded pipes with different diameters, and it has a hexagonal head for an increased bearing surface when adjusting the Fittings with a wrench. It has male NPT threads for connecting to female threaded pipes, creating a tighter seal than straight threads. This Fittings 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 operating temperatures for this Fittings range from -53 to 121 degrees C (-65 to 250 degrees F). This Fittings 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 Fittingss are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. When purchasing pipe Fittingss, consider the application, as this will affect material type, shape, size, and required durability. Fittingss are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).