Gear Dive
Is there a diving gear called 'divi' or something like that? What is it?
I think you are referring to a D.V. It's short for demand valve, and is the system you use to breathe from. It's attached to your air tank and has 2 stages: the first stage is on your tank and it reduces the pressure of the air in the tank to just above ambient pressure . Ambient pressure is that which applies to your whole body at whatever depth you are at and increases with depth. The second stage is attached to the first stage by a pressurized hose and is the piece you put in your mouth. It delivers air at the ambient pressure and has a means of taking your exhaled air away from your face (to avoid it obscuring your vision.
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