The inflator of a BCD, or Buoyancy Control Device, is a mechanism that divers use to manage the amount of air in the BCD bladder. It typically consists of a button or lever connected to the regulator. When pressed or pulled, the inflator allows air to enter the BCD bladder, inflating it and increasing the diver’s buoyancy. This is useful for ascending in the water.

Conversely, pulling the inflator button or lever in a different way or toggling a separate control releases air from the BCD bladder. This deflates the bladder, reducing buoyancy and aiding descent or achieving neutral buoyancy at a specific depth. The BCD inflator is a vital component for divers to control their buoyancy effectively during a dive, providing versatility and control over their underwater experience.