Pricing mentioned is for EA. Requires a minimum buy of 1 piece. Brass Cylinder Adapters, CGA-510 POL Acetylene To CGA-300 Commercial Acetylene; Hazmat=False; Features=Adapters should not be used as permanent installations;Use a brass cylinder Adapter to connect a regulator to a cylinder or other equipment when different CGA threads on the mating parts make a direct connection impossible; StandardPack=1EA; CountryOfOrigin=US; Material=Brass;