While the housing is permanent

Does this include a sensing bulb and capillary tube

significantly exceeding the performance of standard 5-micron shop filters

For contractors performing annual maintenance or emergency repairs

Enhanced Compatibility: Features multi-standard screws for easier installation across local and international hardware standards

Lennox 12L20 Pressure Switch 323055-751 While the housing is permanentThe Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system