The SR Series operates using Hydrotab’s revolutionary patented technology. The motion of the interceptor is controlled with a high resistance bladder which is expanded pneumatically. 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). In addition, this innovative pneumatic mechanism allows us to apply on the blades high shifting forces. Those high shifting forces applied to the blades guarantee that interceptors will continue operate and remain unblocled even under extreme barnacle and marine growth! Consequently, that simple but innovative peneumatic mechanism makes Hydrotab interceptors indestructible, and allows at the same time an easy and quick installation!