Dwyer Instruments A4-3 Dwyer Instruments Pressure Switches, A4 Series Differential Pressure Switch 25-45 MFG Item Number A4-3 Series A4 More specs More specs Decreasing Pressure 10-21 psi Increasing Pressure 25-45 psi Contact Type SPDT Current Rating 0.25 A @ 120 VAC, 0.25 A @ 175 VDC Connection Process: 1/4 NPT Female Electrical Connection 12 " Leads Material Aluminum Gauge Proof Pressure 500 psig Net Weight 0.6 lb Gross Weight 0.6 lb Qty – + Add to Cart