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At 01:51 PM 1/15/99 EST, Scaleworks@ao*.co* wrote: >To suggest that a single with a y valve is a better setup is absurd. Where is >the redundant air source? Why is the single w/pony better than a single w/Y valve? (Let's say the diver owns his/her cylinders so employing a Y valve is an option). The only failure point advantage of the pony would be the burst disk and neck o-ring. Neither has a high failure rate. The failure mode for the o-ring, when it does fail, is usually a slow leak that in no way would require a bail-out. We all know how to make the risk of burst disk failure zero. If you're willing to discount these advantages of the pony because of the low likelihood of failure (the sort of calculated risk we take all the time), then all you're left with is more gas. Then I think gas management and dive planning are the proper tools, not the pony bottle. Art Greenberg artg@ec*.ne* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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