PS41 Series Pressure Switch with {10} Pressure Range Code, {4MNB} 1/4" NPT Brass, {C} SPDT, {FL18} Flying Leads 18", {IP} Ingress Protection, {FS4PSIR} Factory Set to 4 psi Rising. The switches utilize a piston/diaphragm design, which incorporates the high proof pressure of piston technology with the sensitivity of diaphragm designs. Switches are field adjustable via an Allen head screw that is hidden to protect against unauthorized tampering. A protective sheath for the wiring and quick-connector are added for in-field durability and easy connection. Connects to the Arable system via the Arable Bridge.