Smith B625 Polaris P61 0.75HP 115/230V Pool Cleaner Booster Pump Motor. The B625 3/4 Horsepower Threaded Shaft replacement Booster Pump Motor by AO Smith fits the Polaris PB4-60 pool cleaner booster pump. The B625 motor replaces the Polaris P61 Booster Pump Motor. Arrival time will depend on your location. If you have any questions, feel free to ask.