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Hi Rich,

I missed Doug's original post on the composite cylinders. I assume that
the cylinders in question are the aluminum/fibreglass ones. I spoke to
a sales rep at a manufacturer (I forget the name right now)
about 1.5 years ago and was informed that the primary reason for
not using them had to do with a weakening of the cylinder due to degradation
of the fibreglass after repeated exposure to the salt water. Why the fibreglass
would degrade with repeated exposure to salt water is beyond me as I typically 
regard fibreglass hulled boats as being rather sturdy in the ocean.

Can anybody confirm/disprove this information?

If that information was incorrect, I might surmise that it is a wariness of
liability that the manufacturer doesn't want to deal with.

Cheers,
Joe Mierwa

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