Common Questions What is the bore diameter of the Lennox 49M62

and 27 liquid level controls

which streamline field service calls

and Quaker branded units

United Electric J40-230 Pressure Switch R-134A Common Questions What is theThe United Electric J40 230 Pressure Switch is a high performance 0 100 PSI mechanical pressure switch designed for critical monitoring in industrial HVACR and process control systems. Engineered with a durable phosphor bronze bellows and brass 1 4" NPT female pressure connection, this unit ensures reliable set point repeatability within a compact skeleton construction enclosure. As the direct updated version of the legacy J40 2309624, the J40 230