The ST Series 1/3 HP Cast Iron / Cast Aluminum Sump Pump is built with premium components for the professional contractor. It is designed with an energy efficient permanent split capacitor (PSC) motor, upper and lower sealed ball bearings for extreme efficiency, high capacity and ultra-quiet operation. It pumps 2,770 GPH (46 GPM) at 10 feet while only pulling 3.8 Amps saving on the electric bill. It is thermally protected, has stainless steel fasteners, and dual carbon-ceramic shaft seals for long life.