174036MF-143 Armstrong S-45 AB All Bronze Centrifugal Pump with 1/4 hp Less Flanges. Flanges sold separately. The Armstrong S-45 AB All Bronze Centrifugal Pump is part of the Armstrong Series S & H series circulating pumps line. In-line circulators are suitable for applications such as hydronics heating and cooling, domestic water systems, multi-stage zoning and general industrial service. Both bronze fitted and all bronze models are available in a wide range of sizes to match the performance requirements of any of these applications. Armstrong Series S & H circulators are durable and trusted products that have been used by HVAC professionals for decades.