Built in thermal protection prevents motor failure due to overloading, accidental run-dry and single phasing or three phase units. * Double inside mechanical seals running in an oil-filled chamber provide for one of the most durable seal designs available. * Double shielded, permanently lubricated, high temperature C3 ball bearings rated for a B-10 life or 60,000 hours provide for extended operational life. * An agitator impeller installed on the extension of the pump shaft. This not only prevents "air locking" but also reduces clogging when solid objects are sucked in. * 2 Year Warranty