The Cleveland Controls NS2-1178-00-.05 Inch WC Pressure Switch is a reliable HVAC safety and control device designed to monitor low air pressure or differential pressure in ventilation systems. It works by sensing pressure changes and activating or deactivating an electrical circuit once the preset pressure threshold is reached, ensuring proper airflow and system protection. Commonly ... https://www.partshnc.com/ns2-1178-00-cleveland-controls-05-wc-pressure-switch