Tusa Active Purge Assist (APA) is a revolutionary pneumatic-assisted purge system for Tusa BCDs. The APA system provides increased flow rates for inflation/deflation for superior performance compared to standard inflators and is incredibly streamlined for reduced drag and bulkiness. The APA system allows for immediate inflate and deflate response, helping you achieve perfect buoyance with precise figertip control. Fits all Tusa BCDs.