Wayne AC/DC Sump Pump System #ISP40 Includes internal float switch for trouble free operation Pumps up to 20,000-gallons on full battery charge Pump dimensions 11-1/2-by-9-3/4-inches; base pump starts at 12-inches deep and shuts off at 6-inches deep Sump pit has to must be 15-inches deep and 10-inches diameter minimum Discharge head and gallons per hour--0-feet is 3500-gph, 5-feet is 2900-gph, 10-feet is 2400-gph, 15-feet is 1750-gph, and 20-feet is 900-gph 2-year limited warranty