The Pentair Aquatic Eco-Systems Sweetwater® Series 2 regenerative blowers operate at a higher efficiency than traditional regenerative blowers. The cool-running outboard bearing design allows these units to achieve higher differential pressures, provide more cfm per horsepower and extend service life. The rugged die-cast aluminum build is lightweight, compact and extremely quiet. Easy-to-install, close-coupled design means you can quickly add them to your system. And their internal silencers, washable inlet filter and outlet flex hose further simplify installation. Oilless and virtually maintenance-free. CE Compliant and UL Recognized. TEFC motors operate at both 50 and 60 Hz. Three-year warranty. SST45 and larger ship motor freight.