The NRF-22, part number 103251, is a 120V Red Fox iron circulator pump with a 1/25 horsepower motor. It's designed to replace older Xylem-Bell & Gossett models, including the SLC-25, 511-405-118, and SLC-30. This pump efficiently circulates fluids in residential and light commercial heating or cooling systems. https://www.partshnc.com/nrf-22-xylem-bell-gossett-103251-120v-red-fox-iron-circulator-125-hp-replaces-slc-25-511-405-118-slc-30