Taco 007 BF5-J Circulating Pump with Bronze Cartridge for longer life then standard 007-F5 Taco 007 BF5-J Circulating Pump is the Direct Replacement for Base Model 007-F5. Standard High Capacity Output Compact Design Cast Iron pump with a Bronze Cartridge Quiet, Efficient Operation, Unique Replaceable Cartridge Design-Field Serviceable Unmatched Reliability --Maintenance Free, Comes with New Gaskets for flanges