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Bell & Gossett PD series cast iron, in-line circulator pumps are intended to pump water through closed loop systems for heating and cooling. The PD series is designed for applications that require increased flow and head pressures. These dependable pumps feature a three-piece design, which includes a motor, bearing assembly, and volute. This innovative design provides for easy field service as the bearings, shaft, and seal are all housed within the bearing assembly. That assembly can then be easily repaired or entirely replaced without disturbing the other components of your pump. The PD series' resilient motor mounting is another feature unique to Bell & Gossett. The mounting, combined with spring-loaded couplers, means your pump will run quietly and efficiently. This series also features a plastic impeller. BELL & GOSSETT PD SERIES CIRCULATOR PUMPS Model Comparison Chart Model COnnection Size HP Voltage Phase GPM Max. Head PD35S 3" 1/2 115/230 1 115 23' PD37S 3" 3/4 115/230 1 135 30' PD37T 3" 3/4 208-230/460 3 135 30' PD38S 3" 1 115/230 1 145 31' PD38T 3" 1 208-230/460 3 145 31' PD40T 3" 1-1/2 208-230/460 3 152 35' PD40S 3" 1-1/2 115/230 1 152 35' PERFORMANCE CURVES SPECIFICATIONS EXPLODED VIEW REPAIR PARTS INSTALLATION MANUAL Bell & Gossett PD Series Circulator Pump Installation Manual BROCHURE Bell & Gossett PD Series Circulator Pump Brochure Pump Products application engineers are standing by to help you find the right pump, as well as to provide price quotes, stocking availability and shipping information. Call our toll free number 1-800-429-0800 to speak to an expert today.