McDonnell & Miller FS7-4 Switch 30067439-890 the precision-ground stainless steel valve

the precision-ground stainless steel valve instantly lifts from its seat

The 530 series is specifically engineered to discharge water

Is the NBR seal compatible with all fluids

Depending on the specific air handler model

When you're out on a service call for a dead furnace or air handler

McDonnell & Miller FS7-4 Switch 30067439-890 the precision-ground stainless steel valveThe McDonnell & Miller FS7 4 is a heavy duty, industrial liquid flow switch designed for high capacity systems requiring precise monitoring of start stop operations. Engineered with a 1 1 4" NPT connection and a SPDT snap switch, this unit serves as a critical safety interlock for large boilers, chillers, and process cooling applications. It features a maximum operating pressure of 300 PSI and can handle liquid temperatures up to 300F (149C). The Part