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These big rubber knobs are recommended because they bend, rather than break, which means
that if you hit something, they won't break off, leaving you unable to shutdown your
gas supply. Also, being big and chunky, they are much easier to turn with cold hands and
thick gloves. They fit both ScubaPro and MDE valves, but not Apeks ones. (That's OK -
Apeks valves are crap and we don't use them anyway).
The ScubaPro isolation manifold is preferred because it has a double barrel o-ring design.
Unfortunately, the standard knobs are not as good as the Sherwood rubber knobs, so get them
changed.