UPD : Heavy Duty Couplings – Group Joint Type, Plated : Wing Nut Only – GJW150

For high pressure air and water service, steam, sanitary, high pressure spray, LPG and anhydrous ammonia service, petroleum products and chemicals: All parts plated malleable iron. Insert and spud may be either steel or malleable iron.
NPT Male and Female spud. Female wing nut-to-spud connection is NPSM ground joint.