Simplified Maintenance: The replaceable motor and powerhead design allow for field repairs without draining the hydronic loop

As a direct replacement for the 9004714115

Corrosion Resistance: Stainless steel ball and stem prevent premature wear in high-duty cycle environments

Rotational: 450 foot pounds on 1/2-inch tubing

providing a critical pneumatic link between the inducer motor

Lennox 78W57 Pressure Switch 321894-709 Simplified Maintenance: The replaceable motorThe Lennox 78W57 Pressure Switch is a high precision, factory authorized OEM replacement engineered for draft proving and airflow safety monitoring in Lennox heating and cooling systems. Specifically calibrated to actuate at 0. 27" WC (Water Column), this SPST pressure switch features a 1 4" barb connection for secure integration into existing 24V control circuits. Designed as a direct replacement for Lennox part number 101572 04, it is a critical