United Electric (UE) H121-452, Adjustable Pressure Switch, 30" Hg Vac to 20 PSI Set Point Range, 0.1 to 1" Hg Fixed Deadband, Undefined Over Range Pressure, 225 PSI Proof Pressure, Buna-N Diaphragm, 1/4"NPT Female Stainless Steel 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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