4/10 hp Submersible Sewage Pumps designed to handle 3/4" solids. Permanent split capacitor (PSC) motor, heavyduty cast iron housing, volute and cover, non-clog thermoplastic elastomer impeller and thermal overload protection. The "RF" automatic models feature a “piggyback” mechanical float switch with an “on” range of 9" to 14" and a 2" to 6" “off” range.