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I used them with my Drager Dolphin rebreather, then with my Poseidon MkVI rebreather. I've moved to a Poseidon SE7EN Rebreather with Steel cylinders. Just don't have a need for them any longer.Well this is a first for me.. I knew of 19s and 30s but never 27s. I'm guessing a little fatter then 30s but also a little shorter? How did you use these if you don't mind me asking?