The 0013-IFC with an Integral Flow Check is designed to reduce installation costs when zoning on high head / high flow hydronic or radiant heating, hydro-air fan coils or heat exchangers and geothermal systems. By locating the removable, spring-loaded IFC inside the pump casing, a separate in-line flow check is eliminated, reducing installation costs. The reduced pressure drop of the IFC, increases the 0013 flow performance over in- line check valves. Both the IFC and cartridge are easily accessed for service instead of replacing the entire unit.