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 5835-01-376-8454
NSN 6130-01-160-7772
NSN 5895-01-049-5226
NSN 6650-01-199-7347
NSN 5920-00-690-1930
NSN 6150-01-587-5849
NSN 5895-00-276-5475
NSN 6320-00-731-6134
NSN 7035-01-429-7954
NSN 7035-01-013-9889
NSN 5855-00-928-1912
NSN 5910-00-129-6266