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 5960-01-425-1454
NSN 6145-01-226-7594
NSN 2925-01-432-7752
NSN 6130-01-566-7659
NSN 5975-00-734-4606
NSN 6645-01-615-9875
NSN 7035-01-227-2546
NSN 5835-00-092-1136
NSN 5965-01-572-2937
NSN 5965-01-416-4059
NSN 6645-01-435-4073
NSN 5925-01-142-5819