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> Bill, use them if you have them. I have found them unnecessary.
> However, if you can suggest a good source for the tiny o-rings in the hp
> spools that are more durable, I WILL replace those.These tend to mush
> out + Also, getting the correct durometer o-rings for each application
> is well beyond the farm animal stupidity that is the trademark of most
> dive shop savants.


These Viton material are much harder than regular Nitril. If the regular
rings tends to mush maybe the Viton material is the answer.
I spoke with a major O-ring manufacture/distributor, who have  ANY size and
material available.
They told me that the regular Nitril O-rings, when you have cleaned them,
are just fine for oxygen use within normal temperature range. 

regards
Atle Aamodt
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