The Johnson Controls P70AB-12 Pressure Control Differential is a pressure switch that is efficient and durable for HVAC applications. It works between -40°F to 140°F temperatures and can manage up to 240 volts voltage. By having a pressure regulation capacity of 500 PSI it can regulate pressures in different systems. https://www.partshnc.com/1280-open-lo-5-35dif-spst