Armstrong Pumps 110223-305 Armstrong Astro 230Ci 1/25 Hp Circulator Pump ASTRO 230CI is a hydronic circulator that conserves energy and eliminates maintenance Efficient/Quiet Operation Universal Flange to Flange; 3-speed Design Intended for circulating water in closed hydronic/solar heating systems It is designed with no mechanical seals/couplers to replace, and no lubrication is required Manufacturer Part Number: 110223-305