Liberty Pumps PC457-441 1/2-Horse Power PC-Series Sump Pump Combo, Models 457 and 441 1/2 horse power primary pump with maximum discharge head of 33-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)