Xylem-McDonnell & Miller 851 Makeup Wtr.Feeder,35#,#136700

The Xylem-McDonnell & Miller 851 Makeup Wtr. Feeder,35,136700 is likely a component found in hydronic heating systems, such as boilers or chillers. This looks to be a makeup water feeder, probably for boilers in hydronic heating systems. Its function is to replenish the system's water supply automatically when its levels fall as a result of leaks, evaporation, or other causes. It is unclear how exactly things operate in the absence of precise technical knowledge. However, float valves are commonly used in cosmetics water feeders. Fresh water can enter the system when a valve opens due to the float's descent as the water level drops. The float rises to the desired level, shutting the valve and cutting off the water flow.