Image:Aqua lung.JPG

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I took this photo of an Aqualung myself

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Illustration of now standard multiple-port-and-hose primary regulator design which has been termed the "octopus." The unit has a handle for carrying. The blue knob is the main cylinder closure valve (necessary to turn off the cylinder when the rest of the system is removed from it). Note the yoke-type adapter (not DIN) on this cylinder. The low-pressure hose beginning with the beginning green wrap at the left, goes to the primary second-stage mouthpiece, which the diver normally has in the mouth. The corresponding beginning-yellow low-pressure hose on the other side, is usually intended to go to a safety mouthpiece (here missing, since it is probably part of an integrated safe-second and buoyancy compensator). The black pod with round dial on the floor in front of the tank, which caps a high-pressure hose that exits the primary regulator at a higher level than the low pressure hoses, is the depth and pressure gauge; it needs to connect directly to the high pressure part of the regulator because it needs to "see" the remaining pressure in the tank directly. The last (red-wrapped) hose to the right which ends in a connector, is yet another auxiliary low-pressure hose, which may be used for other functions, such as inflating a drysuit.