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The Armstrong S series of in-line circulator pumps is suitable for domestic hot water systems. This series is built using a standard three-piece design that features a radially-split body, oversized shaft, centrifugal impeller, positive mechanical seal, and modular construction. The S series has been used by HVAC professionals for decades because it is cost-effective, durable, and easy to maintain. Features Maintenance free design which has permanently lubricated ball bearings and requires no maintenance at all Radially-split body can be left in-line while servicing pump, eliminating disconnecting of pipes Oversized shaft made from stainless steel Balanced centrifugal impeller ensures maximum water delivery in the HVAC system Proven seal design made from strong and long-lasting materials for extended operating life Three piece modular construction and back pull-out design for easy replacement of wear components Certified ≤ 0.25 weighted average percent lead and complies with California Health and Safety Code Section 116875 (commonly known as ab1953) ARMSTRONG S SERIES CIRCULATOR PUMPS Model Comparison Chart Model Flanges (NPT) HP Voltage Material of Construction GPM Max. Head S-25 Sold separately 1/12 115 Bronze 31 6' S-35 2" 1/6 115 Cast Iron 72 11' S-45 Sold separately 1/4 115 Bronze 109 16' S-46 3" 1/3 115 Cast Iron 112 19' S-55-3 3" 1/2 208-230/460 Cast Iron 121 24' S-35 2" 1/6 115 Bronze 72 11' S-46 3" 1/3 115 Cast Iron 112 19' S-55-1 3" 1/2 115/230 Cast Iron 121 24' S-55-3 3" 1/2 208-230/460 Cast Iron 121 24' S-57-3 3" 3/4 208-230/460 Cast Iron 139 29' S-57-3 3" 3/4 208-230/460 Cast Iron 139 29' S-57-1 3" 3/4 115/230 Cast Iron 139 29' S-45 Sold separately 1/4 115 Bronze 109 16' S-55-3 3" 1/2 208-230/460 Bronze 121 24' S-55-1 3" 1/2 115/230 Bronze 121 24' S-69-1 3" 1 115/230 Cast Iron 160 34' S-69-3 3" 1 208-230/460 Cast Iron 160 34' S-57-3 3" 3/4 208-230/460 Bronze 139 29' S-57-3 3" 3/4 208-230/460 Bronze 139 29' S-57-1 3" 3/4 115/230 Bronze 139 29' S-55-1 3" 1/2 115/230 Bronze 121 24' S-55-3 3" 1/2 208-230/460 Bronze 121 24' S-46 3" 1/3 115 Bronze 112 19' S-57-1 3" 3/4 115/230 Bronze 139 29' S-69-3 3" Bronze 1 208-230/460 160 34' S-69-1 3" 1 115/230 Bronze 160 34' PERFORMANCE CURVES DIMENSIONS DESIGN INFORMATION MATERIALS OF CONSTRUCTION REPAIR PARTS BROCHURE Armstrong S Series Circulator Pump Brochure INSTALLATION MANUAL Armstrong S Series Circulator Pump Installation Manual REPAIR PARTS Armstrong S Series Circulator Pump Repair Parts 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.