The first stage is always on the tank, the second in your mouth, connected to the first stage with a 3 ft hose.
He apparently replaced this hose with a longer one, allowing him to leave the tank on deck instead of carrying it on his back.
There is one drawback to this idea: You need the weight of the tank to actually get and stay under water; some even need extra lead besides the tank.
Without that weight, you bob up like a cork, or have to paddle like crazy, just to stay under water.
Originally Posted by killarney_sailor
First of all, I should admit that I know next to nothing about dive equipment, but we ran into a cruiser who had an interesting device onboard for doing quick checks and repairs. He had taken a dive regulator and separated the primary and secondary stages of the regulator (if I understood his description). He left the primary stage attached to his tank, which stayed on deck while the secondary stage was attached to the mouthpiece by a hose long enough that he work on his keel or whatever. He said that this arrangement allowed him to get in the water much quicker than with tank he wore or setting up a hookah? Comments?