>Any of the above fails you shut of valve of offending reg. You still have 
>access to all your air in both tanks. Independent doubles? Pony and in 
>deco? you are screwed.

Independent doubles???????  

You have two choices, manifolded doubles with or without an isolator.  The
isolator only solves one problem, but it's a big one.  Total loss of your
gas supply caused by a tank O-ring failure.  _If_ you're never going to
dive solo, or get separated from your buddy, you theoretically don't need
the isolator.  

Nanci


>Problem with valve? Shut off isolator. If you are following rule of 
>thirds you will survive. No isolator on your manifold? you are screwed.
>
>A proper manifold made with Orings is probably the most reliable piece of 
>gear you own. Extra failure point is BS. To short yourself by not getting 
>an isolator would be a stroke move.
>
>A cage? Is this a troll? Ben, I don't know about you, but I don't go 
>careening into walls and bulkheads, smashing my tanks into everything in 
>sight. I realize that this is SOP for some divers, but, for some reason, 
>those ranks seem to be thinning out.
>
>  Jim
>
>
>
>On 1/26/98 2:34 PM Ben Greenhouse wrote:
>
>>Hey Folks:
>>
>>    I was wondering what the current thought is on isolator valves.  I 
>>thought
>>that the general consensus was that they were just an extra failure point. 
>> The
>>reasoning (as I remember it) was that the only time you would need an 
>>isolator
>>valve is in the event of a neck o-ring failure on one of your valves.  But 
>>the
>>isolator valve in itself contributed more of a liability since it was more
>>likely to fail than a neck ring.  Or in the event of a collision which might
>>rupture a neck ring, the isolator valve was likely to be damaged as well, 
>>unless
>>you had a cage, in which case you wouldn't need the isolator anyways.  So 
>>what's
>>the thought now?
>>
>>Ben
>
>
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