Manufacturer Name: Cleveland Controls Product Number: NS2-1333-02 OEM Part Number: NS2-1333-02 The Cleveland Controls NS2-1333-02 Pressure Switch is an essential component of HVAC systems, used to monitor and manage air pressure levels in ducts or pipes. This switch works by sensing pressure changes. https://www.partshnc.com/ns2-1333-02-cleveland-controls-pressure-switch