F600B by Jason Industrial | 6" Cam and Groove | Part F | Male Adapter x Male NPT Thread | BrassApplications: Air, Chemical, Food, Material Handling, Mining, Petroleum (including Fracking), Steam, Water Features: Male end fits female coupler or Dust Cap. Male end thread is NPT. Sizes 3 4", 1", 1 1 4", 1 1 2", 2", 2 1 2", 3", 4" and 6" are manufactured to comply with Mil Spec A A 59326A. They will interchange with any coupling manufactured to the same standard. Size 5" complies to an ASTM spec. It will interchange to any other coupling