I am in the market for doubles for cave diving and also for tech diving. The one thing I still have a question about is whether to get a manifold with or without an isolator valve. Some people seem to like having a way to preserve the gas in at least one cylinder in case of a problem. Others say that it is an unlikely problem to occur, so an isolator is not necessary. I'm interested in hearing opinions, along with your rationale. Thanks! -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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