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McDonnell & Miller 114400 FS4-3 General Purpose Liquid Flow Switch (1 Inch NPT, SPDT, 160 PSI)
Vendor:McDonnell & MillerRegular price $280.00 USDRegular price -
McDonnell & Miller 171802 150S-MD Low Water Cut-Off & Boiler Pump Controller (1 Inch NPT, Max Differential, 150 PSI)
Vendor:McDonnell & MillerRegular price $1,595.00 USDRegular price -
McDonnell & Miller 171702 150S High Pressure Low Water Cut-Off & Boiler Pump Controller (1 Inch NPT, 150 PSI)
Vendor:McDonnell & MillerRegular price $1,595.00 USDRegular price -
McDonnell & Miller 172806 150S-M LWCO W/MAGNETIC TYPE RESET
Vendor:McDonnell & MillerRegular price $788.00 USDRegular price -
McDonnell & Miller 149400 67-LWCO-QUICK HOOK UP
Vendor:McDonnell & MillerRegular price $237.00 USDRegular price
Shop heavy-duty McDonnell & Miller boiler safety controls, low water cut-offs (LWCO), liquid flow switches, and automatic boiler feed pump controllers. Trusted by engineers and mechanical contractors for decades, McDonnell & Miller products provide dependable over-temperature protection, precise water level regulation, and fail-safe flow detection in low- and high-pressure steam and hydronic boiler applications.