United Pump UP-1630 Mag Drive Pond, Waterfall & Statuary Submersible or Inline Pump 1630 GPH 12' cord Fully adjustable flow from 0 - 1630 GPH. Ceramic-coated 316 Stainless Steel shaft for ultimate durability. Outlet 3/4" female threaded. UP-1630 has barbed adapter for 3/4" ID tubing. UP models have 3-wire cord with grounded 3-prong plug.