Kris...that one you posted from ebay looks pretty good. Just have to be sure that the fittings between the bottle and the opener are leak free since the bottle valve will be open all the time. Looks like it has a big enough orifice as well. Looks good and the price is right.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap