The Lennox 79L55 is a precision-engineered #42 burner orifice designed to manage fuel delivery within high-efficiency gas furnaces

Built with a robust corrosion-resistant body

with a robust weight of roughly 9 to 17 lbs depending on the specific casting series

restoring factory-standard Natural Gas performance without compromising the integrity of the furnace burner assembly

premium NBR (Buna-N) seals

Mitsubishi Electric PAC-USCMS-MN-1 Maintenance Tool 320819-301 The Lennox 79L55 is aAs a field technician, navigating City Multi, S Series, and M Series multi zone systems requires more than just basic status codes; it demands deep visibility into the M NET transmission line. The Mitsubishi Electric PAC USCMS MN 1 Maintenance Tool, or MN Converter, is the essential HVAC diagnostic interface for professional troubleshooting. Utilizing the high speed USB Type B interface, this tool connects your laptop directly to the units