United Electric (UE) H121-550, Adjustable Pressure Switch, 30" Hg Vac to 0 PSI Set Point Range, 0.1 to 0.6" Hg Fixed Deadband, Undefined Over Range Pressure, 225 PSI Proof Pressure, Teflon Diaphragm with Viton O-Ring, 1/4"NPT Female 316 SS 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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