Built from rugged materials, to be able to handle the toughest sump pump environments, the SI-33V is one of the Basement Watchdog Professional line of heavy-duty sump/effluent pumps. Made with heavy-duty, all cast iron housing, stainless steel hardware, carbon ceramic shaft seal, dual ball bearings, and energy efficient permanent split capacitor (PSC) motor, the SI Series pumps are designed for the toughest sump and effluent pump environments. Engineered to last longer, the SI-33V delivers the sure performance you need and more energy efficiency-saving you money in the long run. This 1/3 HP sump/effluent pump handles up to 4000 GPH and will pass 1/2 in solids. Only pulling 5.0 Amps, with unparalleled capacity, it keeps your sump pit empty while costing less to operate. The dependable construction also provides quiet operation and extended life with a 3-year limited warranty - for Quality You Can Trust.