Lennox 27M18 Orifice 321702-401 these are functionally identical parts

these are functionally identical parts and can be used interchangeably in all supported Lennox equipment

this 2SL-60 assembly features a 24-inch lead for maximum routing flexibility within tight furnace or boiler cabinets

Built for the veteran technician

The stem flat on the 5300-029 is positioned in the "down" orientation for standard 4-way dial alignment

Lennox 27M18 Orifice 321702-401 these are functionally identical partsThe Lennox 27M18 Orifice is a precision engineered 052 sized flow control component essential for maintaining the manifold pressure and combustion efficiency of Lennox commercial and residential heating systems. Designed as a direct OEM replacement part, this orifice (MPN: 27M18, replaces LB 99225) ensures accurate gas metering for Lennox T Class rooftop units and gas furnaces, specifically compatible with models including KGA036S4, KGA092, and LGH180