It is designed to reduce installation costs when zoning with “00” circulators on hydronic or radiant heating. hydro-air fan coils or indirect water heaters. Its cast iron construction makes the 007-F5-7IFC circulating pump a versatile and reliable unit in your system. The patented IFC inside pump casing eliminates separate in-line flow check. reducing installation costs. Reduced pressure drop of IFC increases flow performance by 240% over in-line check valves. The IFC and unique. replaceable cartridge containing all moving parts enable you to service easily instead of replacing the entire unit.