The ASTRO 230CI is a hydronic circulator that conserves energy and eliminates maintenance. Armstrong's Astro 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. Armstrong Astro 2230CI 3-speed circulator provides unmatched performance over a wide range of head and flow requirements. The 3-speed design allows users to match the requirements of an installation exactly. Features: Efficient/Quiet Operation Universal Flange to Flange Dimension (1/2" Diameter bolt holes) Flanges sold separately Cast Iron Construction UL and CSA Listed Benefits: No mechanical seals to leak No couplers to break No lubrication Noryl impeller Vent plug for initial purging if required Stainless Steel shaft Ethylene Propylene gaskets Impedance protected motor Reduced Installation Costs Includes a removable check valve that eliminates the need for additional check valves in the system. For replacement installations, the check valve can be removed as required. International Code Compliance: Astro 2 units are ETL listed for the US and Canada and conform to UL std. 778 and Canadian electrical safety standards CSA std C22.2 No 108-01. Technical Data: Flow Range: 0 to 18 USgpm (0 to 1.14 L/s) |Head Range: 0 to 24 ft (0 to 7.32 m) |Motor: 115V, 60Hz, Single Phase |Max. Fluid Temperature: Closed System: 230A DegreeF (110A DegreeC) |Max. Working Pressure: 150 psi (1034 kPa) - Manufacturer: Armstrong Pumps Inc - Country of Manufacture: China - Manufacturer Part Number: 110223-305.