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The HONEYWELL FS4-3/U is a flow switch designed for use in hydronic and HVAC systems. This flow switch is essential for monitoring the flow of water in heating and cooling systems. It features a one-inch NPT thread connection for easy installation.
This flow switch provides reliable monitoring for water flow, ensuring efficient operation of HVAC systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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