The A.O. Smith one and a half horsepower round flange up-rated replacement motor for swimming pool pumps has a threaded shaft and fits most pumps that require a round flange motor. It operates on both 115 and 230-Volts. The UST1152 is compatible with Hayward Super, Super II, and Max-Flow pumps, Jacuzzi Magnum pumps, and Pentair Pinnacle pumps.