Series PD-35S three-piece cast iron booster pumps are used for hydronic heating and cooling in closed-loop systems. PD-35S pumps are oil-lubricated with a 1/2 HP, 1725 RPM, 115v, single-phase motor. Series PD pumps are small in-line circulator pumps intended to pump potable, domestic water from water heater tanks to areas such as bathrooms and kitchens or non-potable water through closed loop systems for heating and cooling in residential and light commercial applications. It is designed for applications that require increased flow and head pressures. The three-piece design, which includes a motor, bearing assembly, and volute, allows easy field service as the bearings, shaft, and seal are all housed within the bearing assembly. Resilient motor mounting and spring-loaded couplers mean the pump runs quietly and efficiently. A tube of oil, flange gaskets, flanges, and mounting hardware are included.