The Cast Iron Pump is a 1/3 HP all Cast Iron sump / effluent pump with a built-in vertical switch. It is designed with commercial grade materials to be an everyday pump for the professional contractor. It is built for consistent performance using a cool running, energy efficient permanent split capacitor (PSC) motor, with upper and lower sealed ball bearings giving extreme efficiency, high capacity, and quiet operation. It has a cast iron vortex impeller which can pass 1/2 in. solids. It pushes 3200 GPH at 10 ft. while only pulling 5 amps saving on the electric bill. It is thermally protected, has stainless steel fasteners, built-in air relief valve, and a carbon-ceramic shaft seal with a Buna-N-Seal for long life and proven reliability. Its integral vertical switch is compact, dependable and adjustable. If you are looking for an everyday pump, The CIS-33V is as bulletproof as they come.