About the Lennox 80K25 Pressure Switch, IS20407-5896/U
Fixes on your HVAC system can be done by the inexperienced with this Lennox 80K25 Pressure Switch, IS20407-5896/U. At PlumbersStock, we carry preferred brands and reliable parts. 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.