About the Lennox 80W51 Pressure Switch, 0.55, 103247-03
Get to work on your heating and cooling system with this Lennox 80W51 Pressure Switch, 0.55, 103247-03. 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.