Liberty Pumps PC257-441 1/3-Horse Power PC-Series Sump Pump Combo, Models 257 and 441 1/3 horse power primary pump with maximum discharge head of 23-Foot Back-up pump with a maximum discharge head of 23-Foot Ready to connect to 1-1/2-Inch discharge Compact profile will fit minimum 15-Inch Diameter sump pits Offers 5 stage battery charging and protection from battery burn-out or overcharging (12V deep cycle battery not included)