Series HD3 three-piece cast iron booster pumps are used for hydronic heating and cooling in closed loop systems. HD3 pumps are oil-lubricated with a 1/3 HP, 1725 RPM, 115/230v, single phase motor. Series HD3 pumps are reliable, in-line booster pumps intended to pump potable, domestic water from hot water heater tanks to areas such as bathrooms and kitchens or non-potable water through closed loop systems for heating and cooling, as well as, increased flow and head pressure applications. They feature a three-piece design, which includes a motor, bearing assembly, and volute. Since the bearings, shaft and seal are all housed within the bearing assembly, Series HD3 pumps are easily serviceable in the field. Resilient motor mounting combined with spring-loaded couplers means the pump runs quietly. A tube of oil, flange gaskets, flanges, and mounting hardware are included.