Nothing makes me cringe more than watching a diver enter a wreck utilizing a single tank with a K-valve and a single regulator. With this configuration, in the event of a regulator failure, it may be possible to go to an octopus, but you do not have a redundant first stage regulator. You cannot shut…
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Tiny Doubles
![Tiny Doubles](https://www.johnchatterton.com/wp-content/uploads/2013/03/2013-03-09-14.16.54-175x150.jpg)