The LH-series is a submersible three-phase cast iron, high head, drainage pump. The pump is cylindrical and slim and can be installed in a well casing for deep well dewatering. The central discharge flange allows the pump to be “hung” on the discharge pipe. The top discharge, flow-thru design provides maximum motor cooling efficiency, allowing continuous operation at low water levels and extended dry-run capability. The pump incorporates seal pressure relief ports that relieve the pump pressure before it reaches the shaft seal.