John, Manufacturers usually tell their customers if a regulator is "cleared" for use with nitrox. Either they say it is ok, or they don't recommend the regulator for use with nitrox. The rule of thumb is that up to 40% O2 is ok for any regulator. For more than 40% O2, you should have your regulator O2 serviced, or buy a regulator that is made for that specific usage in mind. If you want to go by the manufacturers rules, maybe you should consider the brand Apeks, sold as zeagle in the US. Apeks regulators are that are "cleared" from the manufacturer for use up to 40% O2, and they have special regulators that are "cleared" up to 100% O2. Preben -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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