Brass Cylinder Adaptors, From CGA 300 Commercial Acetylene To CGA 520 B Tank ORS NASCO Large dimension range provides comfortable Large dimension range provides comfortable fit that is 17% more adjustable than earlier versions Wide cup opening area increased by 16% over earlier versions New unique memory foam combines denser and softer foam than previous models solvent resistant seal that will not tear or decay Parts disassemble easily even after extended service Reduces inventory costs – no need for large inventory of cut gaskets Use a brass cylinder adaptor 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