Sump/Battery Back-Up System 1/3 HP Discharge NPT (In.) 1-1/2 115 Voltage 12VDC Voltage - Back-Up 5.2 Amps 13.00 Amps - Back-Up Switch Type Vertical Float 12VDC Battery Charger 900 mA Max Flow (GPH) 2700 Max Flow (GPH) - Back-Up 2700 Max Head (Ft.) 21 Max Head (Ft.) - Back-Up 24 Max Dia Solids (In.) 3/8 Max Dia Solids (In.) - Back-Up 1/4 GPH of Water @ 0 ft of Head 2700 (Primary) 2040 (Secondary) GPH of Water @ 5 ft of Head 2280 (Primary) 1530 (Secondary)