Lochinvar & A.O. Smith 100208661 Flow Switch 320788-704 Its rugged construction provides reliable

Its rugged construction provides reliable low water protection in gravity-return systems

making them fully interchangeable in the field

is a heavy-duty side-wall venting solution designed for oil or gas-fired appliances

this is a dedicated steam pressure relief valve

Dual-temperature control allows for automated night setback

Lochinvar & A.O. Smith 100208661 Flow Switch 320788-704 Its rugged construction provides reliableThe 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