O-rings

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I use 90s for yoke valve to regulator and tank neck, and 70s for hoses and just about everything else except a few oddballs like piston rings.

Air-Oil has viton 90s and other goodies at very reasonable prices - higher than the ones on the on-line ordering form, but still cheaper than anyone else I've found - but you have to call and ask for them.

That said I am not a big fan of viton for anything except maybe gear that will see 100% for extended periods and equipment that came originally equipped with it.

FrankT:
On the subject of O-rings. What Durameter should be used for locations like valve to tank neck and hose connections? 90?
 

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