The 174035MF-113 Armstrong H-41 Bronze Fitted Cast Iron PumpĀ is part of theĀ Armstrong Series S & H series circulating pumps. 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.