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Stainless Mercury Propeller 48 72762A4 P19 15 spline US $69.99 |
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Suzuki Stainless steel prop propeller 245 P pitch V6 US $225.00 |
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Stainless Boat Propeller OMC 14 1 4 Inch x 21 RH 389923 US $200.00 |
The cup is a curved lip on the trailing edge that allows the prop to get a better "bite" on the water by holding the water on the blade longer. It will typically reduce the amount of slippage and ventilation that occurs.