Rolair PS1212 Pressure Switch

Rolair PS1212 Pressure Switch is a four-port control valve with an integrated unloader valve and a manual on/off lever, engineered for an operating window of 95 on / 125 off psi. This compact switch governs the compressor motor by sensing tank pressure and cycling the motor to maintain steady delivery, while the unloader valve vents the head pressure at shutoff to facilitate load-free restarts. The four-port design supports typical connections found on Rolair’s four-port, unloader-equipped switches, providing a reliable, serviceable control solution for shop and portable air compressors. The built-in lever offers a straightforward manual override for testing or servicing without disturbing the electrical circuit, aiding maintenance and troubleshooting in busy workshop environments.