LifeGuard Safety Hose Technology’s Safety Shut Of System. Te hydrogen industry’s only hose and coupling system that instantly and automatically shuts of the fow of fuids in both directions. In the event of a hose and coupling failure or excessive stretching, a patented internal cable connected to valves at each end of the hose closes the valves automatically. Te result spills are maximized or eliminated before they happen. Along with the price of clean up and increased regulatory involvement.