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If it is tankmounted then you have exactly the same downsides as the main tank itself, ie. it can lose gas without you knowing, and then when you need it, it is empty or has an inadequate supply. If it is turned on then it can freeflow. In fact, turned on and backmounted all of the perceived weaknesses in your main tank are duplicated, except now of course you have something on your back just waiting to catch on line, kelp, wrecks whatever.
| So whats the difference between this and twins, manifolded or otherwise ? I doubt very much if you dive with your left post isolated, in fact, if you follow this argument through to its conclusion, shouldn't you in fact be diving sidemounts rather than twins?
ATB,
John
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