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 5920-01-576-9327
NSN 5985-01-357-7200
NSN 5920-00-791-5446
NSN 5996-01-314-2354
NSN 4140-01-634-0330
NSN 5895-00-223-1697
NSN 5975-01-374-8427
NSN 5835-01-488-6678
NSN 6130-01-436-3611
NSN 5935-00-384-3000
NSN 5925-01-604-0159
NSN 6320-01-162-5977