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 5975-01-224-8672
NSN 5855-01-444-4228
NSN 5985-01-359-7167
NSN 5965-01-572-7803
NSN 5855-01-419-5285
NSN 6135-01-252-0315
NSN 6110-01-392-9565
NSN 6650-01-283-6238
NSN 5855-01-610-5231
NSN 5935-00-977-6216
NSN 6240-00-690-2274
NSN 5910-00-546-1772