A fitting used with a union nut and thread piece to form a union.
NSN 6645-01-174-0859
NSN 6150-01-108-6528
NSN 5915-01-421-8290
NSN 5935-01-023-1590
NSN 5925-01-411-5101
NSN 5935-01-457-3960
NSN 6135-01-327-2092
NSN 6110-01-615-2925
NSN 6135-00-708-0892
NSN 6320-00-925-0558
NSN 5945-01-037-6436
NSN 5945-00-853-1384