Viton 75 Durometer good enought for yoke ?

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st1650

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I'm shopping for some spare o-rings and I need to know what would be the best material for yoke tank o-rings.

The correct size is:

Dash No. I.D. O.D. W.

-014 1/2 5/8 1/16


Correct?
 
I think I'm using nitrile in 90 duro. But viton or EPDM probably better if it will see 100% O2. The higher hardness is a bit more resistant to extrusion but that application is pretty forgiving and easy to change if there is a problem.
 
You should be using 90 duromenter for the standard yoke O-rings. Nitrile will last much longer than viton, even on 100% O2. Viton has very poor abrasion resistance and tends to self destruct quickly when used for tank O-rings because the yoke gets turned as the regulator is being removed. I discontinued using viton on on my tank valves a long time ago when I got tired of replacing them every week or so.
 
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https://www.shearwater.com/products/perdix-ai/

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