High Quality Content by WIKIPEDIA articles! A buoyancy compensator (or buoyancy control device, BC or BCD) is a piece of diving equipment worn by divers to provide: life saving emergency buoyancy both underwater and on the surface.The ability to adjust and control the overall buoyancy of the diver and the diver's heavy equipment allowing the diver to achieve neutral buoyancy, remaining at constant depth, or to descend or ascend in a controlled way. Some types of buoyancy compensator also built around the diver's scuba set or are built into its harness. BCs can have the following features: A low pressure direct feed that transports gas from diving cylinder and diving regulator to the BC. An inflation valve that allows gas from the direct feed into the bladders of the BC. A vent valve that allows gas to escape from the bladders of the BC. Most BCs have at least two vents: one at the extreme top and the other at the bottom of the BC.

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