United Electric (UE) H121-137, Adjustable Pressure Switch, 2 to 80" H2O Set Point Range, 2 to 10" H2O Fixed Deadband, Undefined Over Range Pressure, 5 PSI Proof Pressure, Brass Bellows, 1/4"NPT Female Nickel Plated Brass Pressure Connection, Single SPDT 15A 125,250,480 VAC Resistive, External Adjustment, Hazardous Location Explosion-Proof Pressure Switch, Class I, Division 1 and 2, Groups B, C & D, ATEX, Nema 4X Weatherproof Pressure Switch
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