The size is and for plumbing and heating
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Copper alloy tube or pipe fittings
NSN 6650-00-929-0084
NSN 6320-01-029-4220
NSN 6620-00-816-9755
NSN 6610-01-573-5949
NSN 5855-01-234-5346
NSN 5835-01-619-6270
NSN 6150-01-202-1005
NSN 5965-01-632-6566
NSN 5998-00-929-6091
NSN 6620-01-467-2111
NSN 6645-01-167-5814
NSN 6150-00-431-3723