H2Andy
Contributor
Wildcard:LOL! OK, just the second regulator or the whole primary and attached hoses?
the term was first used to refer to a first stage with more
than one hose (for SPG, two or more second stages, etc.).
visually, it looked like an octopus with many dangling tentacles.
somehow, the term was then applied to the back-up
second stage, which looks NOTHING like an octopus.
not sure how that happened, but when someone says
"octopus" today, nine times out of ten they mean
"back-up second stage"