The E7055-NS 1/2 HP All Cast Iron Sewage Pump provides superior performance and exceptional value. It features a high efficiency PSC (permanent split capacitor) motor which uses less amps. It also offers upper and lower sealed ball bearings which increase efficiency and allows for extremely quiet operation. The cast iron, vortex impeller can move 2 solids. The E7055-NS is water cooled, thermally protected and is rated for continuous duty. The cast iron construction is industrial grade leading to greater durability and better performance so, it can handle whatever you flush at it. These premium upgrades result in a powerful motor that offers the total package - superior efficiency, durability, longevity and performance.