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>Well for one reason, if you are filling Nitrox (by partial pressure
>blending) at any of the dive shops in my area, they won't fill if you don't
>have a Viton o-ring (and the magic sticker) as evidence of O2 clean tanks.


By viton, what do they mean? Green, or brown? You'd think a reputable shop
would know that there's more to O-rings - yoke seal Orings especially -
than color. And anyhow, the proper hard yoke seal O-rings usually come in
funny colors too, so how do they know they aren't viton?


Of course, there's no law that says you have to have the same O-ring in the
valve when you get it filled as when you dive. I hear they are not hard to
change.


BTW, Sherwood makes a O2 kit for their valves. Since they are a major valve
OEM, one assumes they may have done their homework on the compound and
duro. Don't know if they sell just the seal O-rings alone, and can't
remember what color they were, but might be worth looking into.


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