Overview Product Description S57, order number 106285MF-132, Three Piece Hot Water Circulator pump, 3/4 h.p. 115/230volts single phase built in thermal overload, fitting in place of Bell & Gosset series PD37. Does not include conduit box. These custom circulators feature the classic horizontal in-line design, engineered for durability and smooth operation. Designed for large flow applications. Impellers and motors are fine-tuned to meet the exact system requirements. Product Videos Custom Field Product Reviews