B600S by Jason Industrial | 6" Cam and Groove | Part B | Female Coupler x Male NPT Thread | 304 Stainless SteelApplications: Air, Chemical, Food, Material Handling, Mining, Petroleum (including Fracking), Steam, Water Features: Female end fits male adapter or Dust Plug. Male end thread is NPT. Bowl has recess for washer replacement. 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