Laterals connect thee pipes together into the shape of a y with one outlet merging into the main line at 45 degrees.
Threaded fittings are easily installed and modified, and used in commercial and industrial environments of a non-critical system, such as heating pipeline, tap water pipeline, etc. They are available with National Pipe Threads (NPT) in male pipe thread and female pipe thread, as well as British Standard Pipe Threads (BSPP, BSPT).