United Pump UP-580 Fountain, Statuary & Waterfall Pump, Submersible or Inline 580 GPH L 5-1/8" W 3-5/8" H 4-3/8" Adjustable flow from 0 - 590 Gallons per Hour Ceramic-coated for ultimate durability in Hydroponic chemicals. Outlet 1/2" female threaded. UP models have 3-wire cord with grounded 3-prong plug.