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 5930-00-862-9777
NSN 6150-01-345-7265
NSN 5920-01-043-4848
NSN 5950-00-022-9976
NSN 5975-00-103-2733
NSN 5985-00-390-8837
NSN 5996-01-362-7068
NSN 5925-01-214-4130
NSN 5930-01-373-9051
NSN 7035-01-305-1950
NSN 6650-01-227-6032
NSN 6105-00-225-9464