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Sean T. Stevenson wrote:
> 

> >2.  Isolator valve on manifold:  Si or No ?
> 
> The isolator is necessary.  In overhead environments, the possibility
> exists to break off the right post knob, and if after doing so you have
> a first stage failure on this post, by closing the isolator you save
> half your gas (and probably your life).
> 

At the risk of being a peon in a holy war, Robert Wood adds:

	Are you seriously telling me that you will be crashing
	around in a wreck or cave with such force and carelessness
	that you are going to be breaking the tank valve/post/knob?

	If this is the case, then rather than add additional 
	equipment, and thus failure points, why not either
	place a small shield by the valve knob (not a cage)
	or use a different design of valve/post/knob?

	How many incidents of broken valve/post/knob have there
	been? Are we not trying to solve a non-existant problem?

[\] Robert Wood   

The St. Lawrence river - fresh, warm, visible diving.

mailto:robert_wood@mi*.co*
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