McDonnell & Miller 64-B Low Water Cut Off 30067439-890 residential models use smaller 1/2"

residential models use smaller 1/2" or 3/4" valves

or immediately if the pressure drop exceeds 10 mbar across the unit

serving as the direct replacement for Y66T13-0

reducing labor time and preventing the recurring valve failures often seen with generic alternatives

reducing system downtime and labor costs for technicians

McDonnell & Miller 64-B Low Water Cut Off 30067439-890 residential models use smaller 1/2"The McDonnell & Miller 64 B Low Water Cut Off (Part Number 143800) is a heavy duty mechanical safety control engineered for both hot water and steam boilers. As a veteran grade float type LWCO, this unit provides essential protection against dry firing by interrupting the burner circuit if the water level drops below a safe threshold. It features a robust 1" NPT connection and is rated for a maximum boiler pressure of 50 PSI. The integration of dual