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Jeff,

A Y-valve has a valve mechanism between the tank and each regulator
fitting.  This allows you to turn off the gas supply to a free flowing
regulator, to shut off the gas suppy to a blown regulator to valve oring.

Essentially, the only emergencies that a Y-valve cannot handle is 
a blown tank neck oring or a blown burst plug or a sheared off valve
limb. (ok, multiple failures where the regulator fails and its valve fails
is another rare happening.)

John

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