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 6685-00-943-7251
NSN 5945-01-371-3828
NSN 5985-01-403-2835
NSN 5835-01-034-2040
NSN 6610-01-370-3886
NSN 6110-00-649-7313
NSN 5835-01-306-5511
NSN 6320-00-036-3688
NSN 6130-01-231-3702
NSN 5998-01-025-8725
NSN 5935-00-649-5956
NSN 5835-00-198-4936