Use a brass cylinder adaptors to connect a regulator to a cylinder or other equipment when different CGA threads on the mating parts make a direct connection impossible. Adaptors should not be used as permanent installations. From Cylinder Service: CGA-200 "MC" Acetylene Material: Brass To Regulator Service: CGA-520 "B" Tank

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The CGA-200 "MC" Acetylene Brass Cylinder Adaptor is made out of brass material for extreme strength and durability. The Brass Cylinder Adaptor allows a connection between threads that cannot be connected directly due to different CGA threads. From Cylinder Service: CGA-200 "MC" Acetylene Material: Brass To Regulator Service: CGA-510 POL Acetylene

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