>1. 7 liter doubles with isolator manifold and two first stages. > >2. 15 liter single with H valve and two first stages. Having gone from 10 l/300 bar tank to 2x7/200 and now own also 2x10/200 here's my thoughts: 15 l + cheaper (probably) + a little more gas - valves hard to reach (at the back of your neck) - awkward because of large diameter (at least in my experience) - need more weight 2x7 l + fit closer to your body => better balance + reaching valves a lot easier, since they stick out +++ when you get larger doubles you can use _exactly_ the same setup and you will have already mastered the right reflexes - heavier on the surface - more expensive -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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