Lennox 25W78 Insert 320074-702 This OEM Trane expansion valve

This OEM Trane expansion valve is a direct replacement for failing metering devices in legacy Trane and American Standard air handlers and heat pumps

Multi-Signal Input: Accepts analog (VDC/mA)

or visible signs of heat damage and burnt traces on the PCB surface

OEM Integrity: A genuine York/Source 1 component ensuring perfect fitment and electrical compatibility with factory control boards

The 22-100000-593 may require the technician to bend to proper configuration to ensure the spark or heat source is correctly positioned within the gas flow path

Lennox 25W78 Insert 320074-702 This OEM Trane expansion valveThe 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