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The Armstrong Astro 2 series of circulator pumps is designed for closed hydronic systems. This series is intended to circulate water or glycol solutions. The Astro 2 series is also designed to work up to 230°F and 150 psi while operating quietly and requiring zero maintenance. Features Ceramic shaft and bearings Cross-reference information is printed on the box, for convenient access e-Coating on the inside of cast-iron volutes provides enhanced corrosion protection for improved reliability Flange-to-flange and bolt-to-bolt compatibility offers quick and easy exchange of competing models Plug-in terminal strip saves time High-flow check valve, is pre-installed for convenience. Where the installation does not call for a check valve, it can be removed in seconds ARMSTRONG ASTRO 2 SERIES CIRCULATOR PUMPS Model Comparison Chart Model Connection HP Voltage Material of Construction GPM Max. Head 230CI Flanged 1/25 115 Cast Iron 18 18.2' 230CI-R Flanged 1/25 115 Cast Iron 18 18.2' 250CI Flanged 1/20 115 Cast Iron 18 24' 250CI-R Flanged 1/20 115 Cast Iron 18 18.2' 210CI Flanged 115 Cast Iron 34 16.5' 250SS Flanged 1/20 115 Stainless Steel 18 24' 225BS 1/2" Sweat 115 Bronze 9 12' 230SS Flanged 1/25 115 Stainless Steel 18 18.2' 225BS 3/4" Sweat 115 Bronze 9 12' 220SSU Union 115 Stainless Steel 9 5.5' 220SSU 1/2" Sweat 115 Stainless Steel 9 5.5' 225SSU Union 115 Stainless Steel 14 12.8' 220SSU 3/4" Sweat 115 Stainless Steel 9 5.5' 280CI Flanged 115 Cast Iron 30 31.2' 280CI Flanged 230 Cast Iron 30 31.2' 290CI Flanged 115 Cast Iron 52 14.2' 286CI Flanged 230 Cast Iron 35 40' 286SS Flanged 230 Stainless Steel 35 40' 210SS Flanged 115 Stainless Steel 34 16.5' 290SS Flanged 115 Stainless Steel 52 14.2' 280SS Flanged 230 Stainless Steel 30 31.2' 280SS Flanged 115 Stainless Steel 30 31.2' PERFORMANCE CURVES DIMENSIONS SPECIFICATIONS REPAIR PARTS TROUBLESHOOTING BROCHURE Armstrong Astro 2 Series Circulator Pump Brochure INSTRUCTIONS Armstrong Astro 2 Series Circulator Pump Instructions REPAIR PARTS Armstrong Astro 2 Series Circulator Pump Repair Parts CURVES Armstrong Astro 2 Series Circulator Pump Curves Pump Products application engineers are standing by to help you find the right pump, as well as to provide price quotes, stocking availability and shipping information. Call our toll free number 1-800-429-0800 to speak to an expert today.