| Bar | A measure of pressure, 1 bar = atmospheric pressure or about 15lbs per... |
| BSAC | The British Sub-Aqua Club or BSAC is the governing body of recreationa... |
| Bail-out Bottle | A cylinder with an emergency supply of breathing gas to bails one out ... |
| BCD | A buoyancy compensator (or buoyancy control device, BC or BCD) is a pi... |
| Burst Disk | A thin disk preventing the pressure in your tank from exceeding the ma... |
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