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 5910-01-202-2689
NSN 6685-01-082-3764
NSN 5960-01-217-1479
NSN 5975-00-702-2149
NSN 5920-01-546-0492
NSN 2925-01-633-4048
NSN 5905-01-302-8803
NSN 5855-00-149-0766
NSN 5985-01-258-1049
NSN 5925-00-059-1140
NSN 6320-01-412-2973
NSN 5925-00-013-9423