Venstar VST4900 Thermostat 320819-301 which protects the valve stem

which protects the valve stem from pitting and crevice corrosion in treated boiler water or cooling tower applications

How does this valve handle oxygen-rich environments

it prevents downstream equipment damage

6-inch diameter and resilient ring mounting compatibility

Automatic Reset Logic: Eliminates manual intervention by automatically restoring the circuit once temperatures return to a safe 120°F

Venstar VST4900 Thermostat 320819-301 which protects the valve stemThe Venstar VST4900 Thermostat is a professional grade digital programmable thermostat engineered for high performance climate management in residential and light commercial applications. Serving as the primary Venstar VST2900 replacement, this Slimline Series controller handles complex HVAC configurations, including 4 stage heating and 2 stage cooling. Technicians will find the non volatile memory critical for retaining program settings during power