The Nordyne 632656 Dual Pressure Switch .7/.2 WC is a safety control component designed to monitor and verify proper air pressure conditions within HVAC systems. It operates by sensing pressure changes in the venting or combustion system and opening or closing electrical circuits when preset pressure levels are reached. This switch is commonly used in compatible gas furnaces and heati... https://www.partshnc.com/632656-nordyne-dual-press-switch-72-wc