The new WhisperfloXF™ pool pump was developed using the most advanced engineering tools available -- CFD (Computational Fluid Dynamics) and FEA (Finite Element Analysis). The proprietary impeller design delivers a higher level of precision concentricity for increased efficiency. The proprietary hydraulic isolator smooths the water flow inside the volute, raising the efficiency even higher. With capabilities in excess of 200 gpm, WhisperfloXF is an ideal choice for many residential and commercial applications; especially those involving water features, negative edges and slides. Features: Select 2-speed WhisperfloXF™ High Performance Pump models are now ENERGY STAR® Certified New upgraded dual-compartment motor for simplified field wiring New hydraulic isolator separates priming water from pumping water for faster priming, more turbulence-free flow and increased efficency New union connectors included for connecting directly to 2.5" or 3" plumbing Diamond seals made of oxidation-resistant, self-retaining EPDM rubber for increased durability and tighter seal Extra-large, robust basket with smooth surface for easy debris removal Drop-in replacement for original Whisperflo®; and optional riser plate enables easy Challenger® replacement Modular plumbing system means less need to cut and glue pipe External port threading and tool-free union nuts need only hand-tightening Easy-carry handle; easily removable, ergonomic lock ring; and see-through lid for easy basket inspection Three-Phase TEFC Super-Duty: 022017 - XFK-8, 208V - 230/460V, 5.9 - 5.6/2.8 amps, 2 hp, 1.2 SQ FT 022018 - XFK-12, 208V - 230/460V, 8.3 - 7.8/3.9 amps, 3 hp, 1.15 SQ FT 022019 - XFK-20, 208V - 230/460V, 13.9 - 13.1/6.6 amps, 5 hp, 1.0 SQ FT