Shallow Well Pump, Cast Iron 30 Psi Quality Construction - Close-grained cast iron body. Drain port provided for easy winterizing Precision Molded Diffuser - Pump primes faster, handles more air, with multi-port, precision-molded, reinforced polypropylene diffuser. Motor Windings - Superior insulation materials protect against excessive moisture and contaminantsassure prolonged motor life. Heavy-duty Ball Bearings - Shielded, permanently lubricated bearings, extensively tested to ensure extended life and smooth quiet operation. High-flow version of the 1/2 HP model allows higher flow rates with less horsepower and pressure