This pressure switch is designed for industrial applications such as compressed air systems HVAC equipment, chillers, pumping systems, machine tools, automatic grinders, welders, process equipment, and molding machines. Features include high shock resistance and high set-point stability. Item: Pressure Switch Differential: 4.2 psi Range: 3 to 150 psi Port Type: 1-Port 1/4-18" FNPT Contact Form: SPDT NEMA Rating: 1 Actuation Type: Diaphragm Action: Standard Series: 9012G Ambient Temp. Range: -10 Degrees to 185 Degrees F Media Temp. Range: -40 Degrees to 250 Degrees F