A buoyancy compensator, also called a buoyancy control device, stabilizer, stabilisor, stab jacket, wing or adjustable buoyancy life jacket, depending on design, is a type of diving equipment which is
Jacket type BC on diving cylinder
Surfaced divers with inflated horsecollar BCs
Diver wearing a stabiliser jacket
Diver wearing a wing buoyancy compensator
Backplate and wing
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A backplate and wing is a type of scuba harness with an attached buoyancy compensation device which can be used to establish neutral buoyancy underwater and positive buoyancy at the surface.
Buoyancy compensator (diving)
…Straps (cambands) to secure back-mount cylinders; A plastic or metal backplate to support back-mount diving cylinders; A crotch strap may be included in the harness to prevent the BC from sliding towards the head when the diver…
A stainless steel backplate, wing and manifolded twinset
Backplate with wing style BC, scuba set, and harness Regulator first stage Cylinder valve Shoulder straps Buoyancy compensator bladder Relief and bottom manual dump valve Regulator second stages (with "octopus") Console (pressure gauge, depth gauge & compass) Dry-suit inflator hose Backplate BC inflator hose Oral inflation mouthpiece and manual dump valve Crotch strap Waist strap
A stainless steel backplate with "M"-section centre channel
End view of a backplate showing the "M"-section of the central channel