These switches sense a change in the pressure, opening or closing an electrical circuit when the designated set point is reached. Technical Specifications Operating Pressure: 250 psi Connector(s): 1/8-27 NPT Standard Factory Set Points : 15 psi, 20 psi, 23 psi, & 24 psi Circuitry: NO/NC, adjustable Proof Pressure: 500 psi Product Type: Pressure Switch Contact Setting Range: 14 psi to 24 psi, ±3 psi Electrical Termination: #8-32 screw Contact(s): Silver alloy, gold plated Burst Pressure: 750 psi