The Lennox 78M25 Reversing Valve is a critical OEM component designed for high-performance heat pump systems

ensuring exact physical and electrical compatibility with existing wiring harnesses

the SWT1736 is the correct OEM replacement for compatible models in both lines

Can this control be used for both heating and refrigeration

Always verify the set point on your existing switch's label before ordering

Trane SEN2501 Pressure Sensor 318423-701 The Lennox 78M25 Reversing ValveThe Trane SEN2501 is a critical OEM wind pressure sensor designed for high precision monitoring of differential air pressure within Trane air handlers and furnaces. As a direct cross reference for part NS2 1176 02, this component ensures your system maintains the exact airflow parameters required for efficient combustion and heat exchange. In the field, technicians rely on the SEN2501 pressure switch to provide real time feedback to the control board,