A fitting having three connections with the branch connection fixed at 90 degrees (1.5705 radians) to the run. The tube connection(s) has machine threads (straight threads other than pipe or hose series) designed to accommodate a tube, or is unthreaded and designed to accommodate a tube. The boss connection(s) has external or internal machine threads (straight threads other than pipe or hose series), and is designed to facilitate a gasket, preformed packing, washer, or the like, to form a seal at the boss. It may have side inlet(s). It is used as a junction at the intersection of a tube or fitting and a boss or boss fitting on items such as a tank, housing, valve fitting, or the like. See also tee, tube; and tee, pipe to tube. Excludes connector, multiple, fluid pressure line.
Dept. of the Air Force 
Dept. of the Navy 
Brazil 
Canada 
Republic of Korea Classification: Aluminum tube or pipe fittings (couplings,elbows sleeves)
NSN 5975-01-444-4218
NSN 5975-01-485-8809
NSN 5910-01-152-2051
NSN 5835-00-071-5739
NSN 5930-01-502-1048
NSN 5998-01-078-4885
NSN 6145-01-578-8284
NSN 6610-01-453-4269
NSN 5965-01-449-1101
NSN 6145-00-107-3283
NSN 6610-00-552-6332
NSN 6685-01-067-8474