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The McDonnell and Miller MM 120601 is a FS8-W flow switch designed for fluid flow detection in boiler and related systems. It functions as an electromechanical sensor that monitors water flow and provides a contact output for control or safety interlocks. The unit is listed as an OEM replacement and is referenced in Cleaver-Brooks parts documentation for water level and control assemblies.
Flow detection for boiler systems; OEM replacement MM 120601; Model FS8-W flow switch
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