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reefraff:
oxyhacker:PSI has good stuff but it's fairly expensive. If you are only going to be doing tanks occasionally you can save quite a bit by buying a 2x magnifying mirror from an industrial supplier (McMaster Carr #1017T21 is about $8) and making a tank inspection light from a "rope" or "cable" light - we like the Light Tech 1002, about $10 from Home Depot (the brand doesn't really matter, but you want one that can be shortened, to about 12-18"). A borelight like PSI sells can be had at any gun/outdoor supplier, and many hardware and dept stores, but any small flashlight will do.
Bill High gets good marks from me for usually knowing what the heck he is talking about. That said, given good sealing surfaces (both on the tank and the valve) and proper installation procedures, I don't think it matters enough to matter. Given bad sealing surfaces or improper installation procedures, durometer ratings are not what needs worrying about.Dive4Life:PSI sells the 90 hardness and most others sell a 70. Which one is the best for replacing the neck o-ring? Which ones have you used?