Overview Product Description S35, order number 174033MF-013, Three Piece Hot Water Circulator Pump, 1/6 h.p. 115 volts, single phase built in thermal overload, fitting in place of Bell & Gosset series 2"NFI. 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