The 90-degree street elbow is a stainless steel pipe fitting with male National Pipe Taper (NPT) threads on one end and female NPT threads on the other for connecting two different types of pipes and fittings. The 90-degree street elbow changes flow direction between pipes and has NPT threads for creating tighter seals than straight threads. It is made from stainless steel, which is higher strength and more corrosion resistant than brass.

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).