McDonnell & Miller 64-B Low Water Cut Off 30067439-890 Designed with a standard 1/2"

Designed with a standard 1/2" x 3/4" NPT connection profile

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

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

fitting wide-ranging Nordyne and Intertherm gas furnace models

For ultra-pure water or special chemicals

McDonnell & Miller 64-B Low Water Cut Off 30067439-890 Designed with a standard 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