1st end is swagelok 2t type.
No other part numbers with same form, fit, and function found.
An adapter having machine threads (straight threads other than pipe or hose series) designed to accommodate a tube on one end or an unthreaded end designed to accommodate a tube. The other end 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 is designed to join a tube or tube fitting to a boss or boss fitting in a straight line on items such as tanks, housings, valve fittings, and the like. See also coupling, tube and nipple, tube.
Classification: Other fittings nesoi of alloy steel not stainless
NSN 4140-01-429-6639
NSN 6145-01-430-2784
NSN 5925-00-066-1271
NSN 2925-00-471-1128
NSN 5930-01-573-6145
NSN 2925-00-724-9252
NSN 4140-01-451-4955
NSN 6135-01-508-3784
NSN 5910-01-364-1166
NSN 5920-00-926-7560
NSN 5835-01-540-4995
NSN 6130-01-548-4030