The Poseidon Cyklon second stage is not compatible with a standard LP regulator hose. Supplied by OmniSwivel International, this adapter has a unique Poseidon Cyklon 60 female fitting on one end and the other end has an industry standard 9/16-18 UNF male fitting on the other end. This adapter will mate with the unique female fitting found on the end of a Poseidon Cyklon second stage and then mate with any standard 9/16-18 UNF female fitting typically found on low-pressure regulator hoses.