Used on cargo truck air brake system. 3a 2nd end thread class 3/8-18 nptf threaded internally on the THREA1E1 external boss end nptf 1st end thread series
3a all ends thread class 2.858" overall length with bulkhead tube fitting end passivate body surface treated male coupling half unjf all ends thread series
3a all ends thread class coupling body anodized blue; coupling quick disconnect end anodized yellow anodize body surface treated male coupling half unf all ends thread series