Replacement vacuum / pressure switch for Lennox pellet stoves. Includes rivets for mounting. Fits the following Lennox pellet stove model: Cascade (WP5)

The vacuum switch is the stoves way of knowing it has an airflow through the venting in the proper direction. If the vacuum switch doesn't see a pressure difference it will not remain closed. When it opens the auger is stopped depriving the stove of fuel and leading to shutdown for safety.