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 5930-01-446-3943
NSN 6650-01-052-2143
NSN 6110-00-583-9821
NSN 4140-01-649-9371
NSN 5835-01-045-3371
NSN 6320-01-486-8004
NSN 5999-00-892-9706
NSN 5855-01-007-9541
NSN 6145-00-515-6931
NSN 5910-01-233-7501
NSN 5925-01-399-0613
NSN 6685-01-006-4936