The most powerful, efficient WhisperFlo® ever 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 U.S. Department of Energy. Drop-in replacement for all WhisperFlo® Pump models.Simple replacement for Challenger® Pumps.* Hydraulic isolator separates priming water frompumping water for faster priming, more turbulent-freeflow and increased efficiency Dual-compartment motor for simplified field wiring Union connectors included for connecting directly to 2.5 in or 3 in. plumbing Diamond seals made of oxidation-resistant, selfretainingEPDM rubber for increased durability andtighter seal Extra-large, robust basket with smooth surface for easy debris removal. Easy-carry handle; easily removable, ergonomic lock ring; and see-through lid for easy basket inspection.