Lennox 54M90 Orifice 328140-751 The McDonnell & Miller SA259-24

The McDonnell & Miller SA259-24 is the upper fitting specifically designed to connect to the top of the gauge glass or water column

Built to interface seamlessly with Danfoss RA series valves and RA2000 manifolds

the B320B is specifically designed for mixing or diverting applications and is not suitable for change-over service

Key Benefits Broad Operating Range: Adjustable from 12°F to 47

Lennox 54M90 Orifice 328140-751 The McDonnell & Miller SA259-24The Lennox 54M90 LP Orifice is a critical metering component designed for precise gas to propane conversion in compatible Lennox heating units. Engineered for durability and high tolerance performance, this 0. 034 inch orifice ensures steady pressure regulation and fuel flow, preventing common combustion issues such as soot buildup or irregular flame patterns. For contractors performing a Lennox furnace LP conversion, using OEM spec orifices is