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-Volt. The B229SE features the big barrel Centurion-Style 56J-Frame and is compatible with Hayward Super, Super II, and Max-Flow pumps, Jacuzzi Magnum pumps, and Pentair Pinnacle pumps.