The 2200 Gallons Per Hour motor is sealed off by a mechanical seal design, while the 1600 Gallons Per Hour model has lipseal. The impeller is carefully designed and tested to maximize head and flow. The 4000 Gallons Per Hour features a robust motor design, mechanical shaft seal, high impact ABS plastic and unique threaded port design. Universal base plate and choice of two different ports makes for a simple installation. Removable check valve provided.• Type: Submersible• Voltage Rating: 12 Volt• Flow Rate: 2200 Gallon Per Hour• Port Type: 1-1/8 Inch And 1-1/4 Inch Hose• Length: Not Applicable• Width: Not Applicable• Height: 7 Inch 2200 Gallons Per Hour Motor Is Sealed Off By A Mechanical Seal Design, While The 1600 Gallons Per Hour Model Has Lipseal Impeller Is Carefully Designed And Tested To Maximize Head And Flow Universal Base Plate And Choice Of Two Different Ports Makes For A Simple Installation | Bilge Pump, Submersible; 2200 Gallon Per Hour