Variable pitch offers both low-speed torque and all-out high speed in one impellerExclusive hub-end water seal keeps the nasty stuff out of precious partsEnhances all-range maneuverability with no slippage in water hookupConstructed of ultra high-strength, corrosion-resistant stainless steelMirror-smooth finish and polished hub resists cavitationOriginal seal required.Choose impeller based on level of engine modification: Limited or Modified. See appropriate columns in chart.Lower pitch impellers recommended for high altitude, pulling or freestyle applications.Impeller pitch is determined by casting, not bending.