Mercury - Flo-Torq SSR Propeller Hub Kit Propulsion System Soft Shift Rubber Design 8M0150151. Overview. There's a certain moment every boater knows - that quiet pause before you shift into gear. You listen, you feel, and you hope everything engages cleanly. With the Mercury Flo-Torq SSR Propeller Hub Kit 8M0150151, that moment becomes effortless. You'll notice how the shift settles gently instead of jolting through the boat. It's the kind of smoothness that makes long days on the water feel eas