The FW Series operates using Hydrotab’s revolutionary patented technology. The motion of the interceptor is controlled with a high resistance bladder which is expanded pneumatically, generating massive shifting forces. This simple idea allows us to have a simple and open-to-the-sea-water mechanism without any need of sealing or use of any sensitive to sea-water parts (gears, shafts, electronic elements, motors, etc).  As a results, this simple but innovative peneumatic mechanism makes Hydrotab interceptors indestructible, and at the same time allows an easy and quick installation!