Grundfos UPS 25-40 circulator pump, code 96281375. 3-speed selectable circulator for domestic and light commercial hot water heating systems. Rp 1" thread, cast iron pump housing, ceramic bearings, canned rotor (glandless, no mechanical seal). Head 4 m at speed 3, flow 3.5 m³/h at zero head. Replaces UPS 25-40 legacy variants. Direct interchange to Wilo Star-RS 25/4 and Xylem Lowara Ecocirc 25-4 in most Rp 1" installations.