Reznor 193811 Pressure Switch 318423-701 It includes the ball joint

It includes the ball joint for a 5/16" push rod

Durable Construction: Built to withstand the high ambient temperatures found in unit heater cabinets near the heat exchanger

Key Benefits Direct OEM Compatibility: Serves as a 1:1 drop-in replacement for the 18K4401

though R-22 remains a primary application for this specific configuration

This kit is the specific McDonnell & Miller 421-30 replacement part for any Series 25A

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