STA-Rite SNF-L 1-1/2 HP Shallow Well Pump 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 Motor Windings - Superior insulation materials protect against excessive moisture. Extensively tested to ensure extended life and smooth quiet operation. Reinforced polypropylene diffuser, Heavy-duty Ball Bearings - Shielded.