Reduced Callbacks: Using factory-authorized parts prevents fitment issues and ensures the system operates at its original design specifications

Industrial-Grade Build: Cast bronze body construction and brass internal trim minimize corrosion and extend the service life of the valve assembly

If your motor is overheating due to improper capacitance or a failing dielectric

preventing nuisance lockouts caused by poor wiring harness connectivity

Lennox 25W78 Insert 318518-761 Reduced Callbacks: Using factory-authorized partsThe Lennox 25W78 NOx Insert is a critical combustion component engineered specifically for Lennox gas furnaces to reduce nitrogen oxide emissions. Designed for high efficiency heating systems, this OEM Lennox replacement part ensures that the burner assembly maintains optimal fuel to air ratios for a cleaner, more environmentally compliant burn. Constructed from heavy duty steel to withstand high temperature furnace environments, the 25W78 insert