Taco 009-BF5-J Circulating Pump Cast Iron with Bronze Cartridge for longer life then standard 009-F5. Standard High Capacity Output Compact Design Unique Replaceable Cartridge Design, Field Serviceable Direct Drive-Low Power Consumption Unmatched Reliability, Maintenance Free Universal Flange-to-Flange Dimensions Low-Lead Compliant Top selling pump for outdoor wood boiler furnaces