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 5985-00-837-5597
NSN 6620-01-189-5037
NSN 5935-01-175-3580
NSN 5950-01-123-9661
NSN 5950-01-381-2280
NSN 6145-01-557-4906
NSN 6320-00-343-1798
NSN 5950-01-164-2489
NSN 6150-01-572-3984
NSN 5925-01-186-8270
NSN 5905-00-081-2738
NSN 6105-01-323-1812