ECO-FLO Products EFSUB10-123 Submersible Deep Water Well Pump, 3 Wire, 230v, 4 Inch, 1 HP, 12 GPM. 1 hip 230V 3-wire 4 inch water well submersible pump with 1-1/4 inch font discharge connection, includes built-in check valve, provides smooth water passages for maximum efficiency; stainless steel splined shaft; hermetically-sealed windings; self-healing resin system; integrated check valve; kingsbury-type thrust bearing; pressure equalizing diaphragm; removable water-bloc lead connector; name mounting dimensions; stainless steel inlet screen; up to 11.1 gym. Stainless steel pump shaft is precision ground for exact bearing fit and straightness. Precision molded impellers and diffusers. Stainless steel pump housing for maximum protection against corrosion.