A fitting used with a union nut and thread piece to form a union.
NSN 5990-00-137-9848
NSN 2925-01-381-5307
NSN 6110-01-157-9341
NSN 5950-00-897-3578
NSN 5835-01-281-7281
NSN 5945-01-651-7182
NSN 6685-01-578-3142
NSN 6135-01-255-9129
NSN 6220-01-468-5596
NSN 5905-01-076-4109
NSN 6135-01-205-5965
NSN 6620-01-514-7786