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>if I play by the IANTD rules, and don't need to be oxygen clean below 40% O2,
>can I use the same cylinder and regs I use with a nitrox fill to get a boat
>fill and continue diving ?

Please remember that this guideline applies to cylinders & valves
only if you're getting filled with pre-mixed nitrox.  If you will
be getting fills at a place that does partial pressure mixing (ie,
if 100% oxygen will be put directly into the cylinder), the tank,
valve, and associated o-rings should be O2-compatible and -clean.
Also, once you O2-clean your valve & cylinder, getting fills on
a boat (or anywhere else) may present contamination problems unless
the fill system is designed to deliver oxygen-compatible air.

Under this guideline, your regs are still OK, because they don't
come in contact with 100% O2, only with the < 40% nitrox once
it's been mixed in your cylinder.

--tab

-- 
        Tracey Baker              tab@pa*.co*
  "I don't think safety is the main issue here...
                          You'd be stupid not to be safe."

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