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There's always an element of apparent randomness to O-ring extrusion -
temperature is often a unappreciated factor, for example.

Can't answer all you questions, but it is worth mentioning that tank neck
O-rings should ideally be harder, less extrudable material than standard
generic 70 duro O-rings, say 90 duro, and should never be greased.


>Well, there I was, sitting at home talking on the phone about a math
>assignment that I have due Wednesday, when I noticed that something was
>sticking out between my tank and the valve.  Upon closer inspection, I found
>that it was the tank neck oring on my doubles that I had filled a couple of
>days ago.  A chunck of oring about a cm long was extruding.SNIP


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