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 5950-01-469-3372
NSN 5915-01-268-0736
NSN 5905-01-357-7271
NSN 6145-00-960-9233
NSN 6220-00-995-6269
NSN 5999-00-452-9641
NSN 5895-01-357-6932
NSN 6620-01-559-9116
NSN 5855-00-408-2611
NSN 4140-01-278-4566
NSN 5915-00-326-2096
NSN 5985-00-165-1945