Simer 2905 Mark Series 1/4 HP Submersible Automatic Sump Pump Thermoplastic body resists corrosion, stress, and heat Pumps up to 1,320 gallons per hour 1-1/4" MPT discharge with threaded coupling Anti-airlock valve Item is 1/4 horse power, not 1 horse power as shown in "Technical Details".Requires a 14" diameter sump, not an 11" diameter sump as stated in the "Product Description".