Armstrong Pumps Astro-250SS 3-Speed Stainless Steel Circulator, 0-18 GPM Flow

**Flanges must be purchased separately A hydronic circulator that conserves energy and eliminates maintenance. Armstrong's Astro 2 Circulator is intended for circulating water or ethylene glycol solutions in closed hydronic or solar heating systems. It is designed with no mechanical seals or couplers to replace, and no lubrication is required. Features Efficient/Quiet Operation Universal Flange to Flange Dimension Cast Iron Construction ETL Listed (conforms to UL and certifies to CSA) No mechanical seals to leak No couplers to break No lubrication 3 speed selection Removable check valve Direct replacement of Armstrong and over 90 competitive circulators Vent plug for initial purging if required Thermally protected motor Five-year Warranty