Wilo Check Flanges

Check valves stop the flow of heat to unwanted areas in hydronic heating systems. They can be installed in-line, but circulators with internal flow checks save the hassle and expense of an extra part. While some circulator pump manufacturers place their flow checks inside the circulator, Wilo puts them in flanges. Available at SupplyHouse in 3/4”, 1”, and 1-1/4” sizes, one flange in each set contains a check valve that accomplishes the same task as one installed in the line or in the circulator.