Sump/Battery Back-Up Combination System 1/3 HP Discharge NPT (In.) 1-1/2 115 Voltage 12VDC Voltage - Back-Up 3.8 Amps 6.5 Amps - Back-Up Switch Type Caged Automatic Dual Float 12VDC Battery Charger 0.4 Amps Max Flow (GPH) 4100 Max Flow (GPH) - Back-Up 2000 Max Head (Ft.) 31 Max Head (Ft.) - Back-Up 15 Max Dia Solids (In.) 1/4 Max Dia Solids (In.) - Back-Up 3/16 GPH of Water @ 0 ft of Head 4100 (Primary) 2000 (Secondary)