The centerpiece of your scuba rig, your BC holds the tank, and secures hoses and accessories. Most supply an integrated-weight-ditch system and roomy cargo pockets while maintaining a streamlined profile. It enables you to safely control ascents and descents, and provides flotation on the surface.

1. Bladder This is the part of the BC that holds the air allowing for buoyancy control at depth. Most modern BC bladders are single layer. Some back-buoyancy BCs and back-plate wings use a double-bladder design with an airtight inner bag protected by an outer nylon shell built to resist tears and punctures.

2. Pockets BC pockets are typically fitted with either zipper or Velcro closures. Jacket-style BCs often have at least two pockets; back-buoyancy BCs often have expandable or fold-down pockets.

3. Exhaust Valves These valves vent air fro the BC bladder. The main exhaust/overpressure relief valve is activated by pulling on the corrugated hose. Remote exhaust valves normally work with pull cords. The more exhaust valves a BC has, the more options you have for venting air while in various positions.

4. Power Inflator Connected to the end of the corrugated hose and tied into the tank’s air supply via a low-pressure hose, this unit includes both inflate and deflate buttons for filling or venting air from the bladder.

5. Integrated-Weight System Available on virtually all BCs, these systems eliminate the need for a weight belt by loading ballast into specially designed pouches, which can be ditched in an emergency.

Want to learn more about BCs?
5 Ways to Care for Your BC