Shape:Threaded Reducer(Male x Male),Connection:NPT-NPT This reducing hex nipple fitting 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 fitting with a wrench. 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 (pipe wall thickness). Megairon is an International Company for distributing professional pipe, fittings, and valves. Meets International Organization for Standardization (ISO) standard 9002. Package: 1 Pc x Reducing Hex Nipple Pipe Fitting