A fitting used with a union nut and thread piece to form a union.
NSN 5920-01-569-5751
NSN 6620-01-334-8938
NSN 5925-01-313-6558
NSN 6105-00-054-3883
NSN 6650-01-240-2334
NSN 5990-01-056-6413
NSN 6135-00-942-7970
NSN 5960-01-174-6975
NSN 6150-00-875-0869
NSN 5905-00-161-0633
NSN 4140-01-228-9602
NSN 5910-00-548-9888