United Electric 120 Pressure Switch - 2 SPDT Switch Output. Adjustable Setpoint Range: 0 to 30 PSI. Proof Pressure: 225 PSI, Dial Divisions: 0.5 PSI. Deadband: 0.1 to 0.4 PSI. External Adjustment via Reference Dial, Single Conduit, Teflon Diaphragm, Viton O-Ring, 316 Stainless Steel 1/4" NPTF Pressure Connection and Cap. Epoxy-Coated Diecast Aluminum NEMA 4X Enclosure for Class I, Div 1 and Class II, Div 1 Use