A fitting used with a union nut and thread piece to form a union.
NSN 5998-01-127-5206
NSN 6135-01-512-8740
NSN 6130-01-536-5844
NSN 6110-00-719-7209
NSN 6240-00-959-6735
NSN 6150-00-835-7772
NSN 5945-01-028-8622
NSN 6135-01-554-1842
NSN 6220-01-044-3378
NSN 5950-00-265-0974
NSN 6650-01-219-3731
NSN 5996-00-100-1238