About the Lennox 69M18 High Pressure Switch, 69M1801
Update your heating and cooling with quality components, like the Lennox 69M18 High Pressure Switch, 69M1801. This is easy to install, whether you are a novice or experienced DIYer. A pressure switch closes an electrical contact when fluid pressure reaches a certain level. This may happen when it reaches a pressure rise or on a pressure fall.