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 6150-00-248-3866
NSN 5905-01-411-8874
NSN 6135-01-171-9299
NSN 5950-00-994-3309
NSN 6145-00-865-2058
NSN 6110-01-136-1497
NSN 5990-00-633-7634
NSN 5935-01-181-5678
NSN 2925-01-300-2897
NSN 5910-00-379-2349
NSN 6150-00-236-5069
NSN 4140-00-089-0490