United Electric H54-25 Pressure Switch 319825-402 Installing a thermostatic air vent
Baker’s notes & crumb story
Description
United Electric H54 25 Pressure Switch 319825 402 Installing a thermostatic air vent Installing a thermostatic air vent like the B4930 at high points or at the end of the steam main allows trapped air to escape this 250 degree high limit switch is identified by its distinct orange dot