Pay in 4 interest-free payments of $28.11 Learn more
Ships within 48 hours · Estimated delivery Aug 30 - Sep 4
Adjustable Performance: Includes six color-coded springs to field-select the desired operating span and 3 to 13 psi control ranges
Commercial Grade: Built to handle the high-cycle demands of commercial-line heaters and hydronic boilers
Demineralized or distilled water with high specific resistance may require specialized high-sensitivity controls or chemical treatment to ensure the circuit completes reliably
Use a multimeter to check for coil continuity or verify the ohms resistance
McDonnell & Miller FS4-3 Switch 30067439-890 Adjustable Performance: Includes six color-codedFor contractors requiring reliable system protection, the McDonnell & Miller FS4 3 (Part Number 114400) is a heavy duty general purpose liquid flow switch designed to monitor flow in heating, cooling, and water process lines. This 1" NPT unit features a single pole, double throw (SPDT) configuration, allowing you to easily integrate signal lights, alarms, motors, or burners into the control circuit. Engineered to operate at a max pressure of 160 PSI
US$ 322.50
US$ 90.00
US$ 170.00
US$ 34.00
US$ 54.00
US$ 25.00
US$ 109.00
US$ 60.00
US$ 109.00
US$ 160.00
US$ 159.00
US$ 54.00
US$ 104.50
US$ 119.00
US$ 105.00
US$ 70.00
US$ 124.50
US$ 79.00
US$ 69.00
