Wayne SSPF50 1/2 HP Stainless Steel Sump Pump with Vertical Float Switch Pumps up to 3900 -Gallons per hour (GPH) 1-1/2-Inch NPT discharge and reinforced thermoplastic base Top suction design to filter debris and minimize clogging Piggyback vertical float switch for automatic operation On level at9-Inch, Off level at 4-Inch