Overview Product Description S25AB, S-25AB order number 174031-043, Three Piece Hot Water Circulator Pump. 1/12 h.p 115V single phase built in thermal overload protection fitting in place of Bell & Gosset series 100, all bronze volute . 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. Flange size, NPT, fits 3/4, 1, 1 1/4, 1 1/2 inch. Product Videos Custom Field Product Reviews