Lochinvar & A.O. Smith 100208661 Flow Switch 320788-704 making them fully interchangeable in

making them fully interchangeable in the field

This 1-inch valve is certified to manage a discharge capacity of 3

Dual-temperature control allows for automated night setback

3/4" outlet)

Direct OEM replacement part for Lochinvar and A

Lochinvar & A.O. Smith 100208661 Flow Switch 320788-704 making them fully interchangeable inThe Lochinvar & A. O. Smith 100208661 Flow Switch, also identified by part number 781621 or alias FS8 W, is a heavy duty liquid flow switch engineered for precise proof of flow detection in high efficiency commercial boiler systems and water heaters. Designed as a direct HVAC replacement part for the McDonnell & Miller FS8 W, this unit features a durable stainless steel #3 paddle configuration to ensure reliable contact closure once the system pump