Hello Andrea, I found the Pentair Optiflo Pump - 3/4 to 1 1/2 HP Parts breakdown. In the motor section (#15) the single speed replacement for your pump is the 1.5 H.P 230/115V Thru Bolt Motor (BN35). I was not able to find reference to any additional 50 cycle motor. (There is also a 1 1/2 HP 2 Speed 115V Thru Bolt Motor available as well part #BN50)
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