Float-Type LWCO

The McDonnell & Miller 140100 model 61 is a low water cut-off for steam boilers. It has 1" NPT female threaded connections and a maximum steam pressure rating of 20 psi. The switch has an automatic reset and uses a 120 or 240-volt power supply. Explore More

McDonnell & Miller model number 63 is a float-operated low water cut-off for steam or hot water boilers. This control features an automatic reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 50 psi and has a tapped 1" FIP connection for equalizing pipes. Blow down valve required. Explore More

McDonnell & Miller model number 63M is a float-operated low water cut-off for steam or hot water boilers. This control features a manual reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 50 psi and has a tapped 1" FIP connection for equalizing pipes. Blow down valve required. Explore More

McDonnell & Miller model number 64 is a float-operated low water cut-off for steam or hot water boilers. This control features an automatic reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 50 psi and has a tapped 1" FIP connection for equalizing pipes. Blow down valve required. Explore More

McDonnell & Miller model number 64M is a float-operated low water cut-off for steam or hot water boilers. It is also for use with model E-11M-24V (SKU: MI1615) or model E-11M-120V (SKU: MI1616) reset switches. This control features a manual reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 50 psi and has a tapped 1" FIP connection for equalizing pipes. Blow down valve required. Explore More

McDonnell & Miller model number 64A is a float-operated low water cut-off with quick hook-up fittings for steam or hot water boilers. This control features an automatic reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 50 psi. Quick hook-up fittings allow for installation directly into gauge glass tappings (1/2" NPT). Blow down valve required. Explore More

McDonnell & Miller model number 67 is a float-operated low water cut-off with quick hook-up fittings for steam or hot water boilers. This control features an automatic reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 20 psi. Quick hook-up fittings allow for installation directly into gauge glass tappings (1/2" NPT). Blow down valve included. Explore More

McDonnell & Miller model number 67G is a float-operated low water cut-off with quick hook-up fittings for steam or hot water boilers. This control features an automatic reset with dual switches with millivolt service for low water cut-off and alarm or electric water feeders. Its maximum pressure is 20 psi. Quick hook-up fittings allow for installation directly into gauge glass tappings (1/2" NPT). Blow down valve included. Explore More

McDonnell & Miller model number 67-LQHU is a float-operated low water cut-off less quick hook-up fittings for steam or hot water boilers. This control features an automatic reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 20 psi. Blow down valve included. Explore More

McDonnell & Miller model number 67M is a float-operated low water cut-off with quick hook-up fittings for steam or hot water boilers. This control features a manual reset with dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 20 psi. Quick hook-up fittings allow for installation directly into gauge glass tappings (1/2" NPT). Blow down valve included. Explore More

McDonnell & Miller model number 69 is a float-operated low water cut-off for mounting into 2-1/2" steam boiler side tappings. This control features dual 120 volt switches for low water cut-off and alarm or electric water feeders. Its maximum pressure is 20 psi and has an insertion length of 4-1/8". Explore More

McDonnell & Miller model number 169 is a float-operated low water cut-off for mounting into 2-1/2" side tappings on steam boilers. This cut-off features dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 20 psi and it has an insertion length of 3-1/8". Explore More

McDonnell & Miller model number 269 is a float-operated low water cut-off for mounting into 2-1/2" side tappings on steam boilers. This cut-off features dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 20 psi and it has an insertion length of 2-1/4". Explore More

McDonnell & Miller model number 369 is a float-operated low water cut-off for mounting into 2-1/2" side tappings on steam boilers. This cut-off features dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 20 psi and it has an insertion length of 1-3/4". Explore More

McDonnell & Miller model number 369 is a float-operated low water cut-off for mounting into 2-1/2" side tappings on steam boilers. This cut-off features dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 20 psi and it has an insertion length of 1-3/16". Explore More

McDonnell & Miller model number 569 is a float-operated low water cut-off for mounting into 2-1/2" side tappings on steam boilers. This cut-off features dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 20 psi and it has an insertion length of 1-3/4" with a 1/4" plug. Explore More

McDonnell & Miller model number 764 is a float-operated low water cut-off for mounting into 2-1/2" FIP side tappings with a nipple directly into the boiler. This cut-off features an automatic reset, dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 50 psi. Explore More

McDonnell & Miller 153700 model 767 mechanical low water cut-off with automatic reset and 2-1/2" NPT connection for steam boilers with 20 psi maximum pressure. Explore More