ELBOW M/F 1/4NPTX1/4NPT

An Elbow M/F 1/4 NPT x 1/4 NPT is a pipe fitting used to connect two pipes at a 90-degree angle.

M/F: This indicates that one end of the fitting is a male (NPT) thread and the other end is a female (NPT) thread.
1/4 NPT: Both ends of the fitting have a 1/4 inch National Pipe Thread (NPT) diameter.
Common applications for this type of elbow include:

Plumbing systems
Gas lines
Air lines
Industrial applications