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Soft-blob field with ribbon-tape seals — cool ice-lab sheet for description and returns.
It includes the ball joint for a 5/16" push rod
though R-22 remains a primary application for this specific configuration
Technicians should check for proper DC voltage at the solenoid and use a manometer to verify that the offset pressure matches the rating plate specifications during the trial for ignition
This kit is the specific McDonnell & Miller 421-30 replacement part for any Series 25A
Key Benefits Direct OEM Compatibility: Serves as a 1:1 drop-in replacement for the 18K4401
Reznor 193811 Pressure Switch 318423-701 It includes the ball jointThe Reznor 193811 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air and venting pressures in commercial and industrial heating systems. As a genuine Reznor OEM pressure switch, it features a Single Pole Double Throw (SPDT) configuration, allowing for versatile control of both normally open and normally closed circuits depending on the system's differential requirements. This specific model is equipped
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