The International Comfort Products 1192715 Vent Pressure Switch Assembly is a safety control component designed to monitor proper venting and draft conditions in compatible gas-fired HVAC equipment. It works by sensing pressure changes within the vent system and opening or closing an electrical circuit when the required pressure is reached, helping confirm safe exhaust operation befor... https://www.partshnc.com/1192715-international-comfort-products-vent-pressure-switch-assembly