The pipe fitting is a Female Threaded Coupling Union with female National Pipe Taper (NPT) threads for connecting two threaded pipes in a straight line to connect, terminate, control the flow and change the direction of the pipe.
Class is a standard relating to tolerance, construction, dimension, and wall thickness, but it is not a direct measurement of maximum working pressure.

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).

Package:
1 Piece x 304 Stainless Steel NPT Female Threaded Coupling Union