Johnson Controls T-4002 Pneumatic Thermostat (covers sold separately)
The Johnson Controls T-4002 Pneumatic Thermostat is a high volume output, single temperature thermostat, direct or reverse acting with 2 pipes and a 55-85 degree fahrenheit set point temperature range. It mounts vertically or horizontally and has an adjustable throttling range/sensitivity.
The T-4002 replaces previous generation Johnson brass pneumatic thermostats and other competitive models. It’s predecessor was first patented in the 1920s. The T-4002 has been a reliable model since the 1960s. It lends itself well to rebuilding and can be easily adjusted by an external set point knob. Whether you purchase new or have yours rebuilt, the Johnson Controls T-4002 pneumatic thermostat series will not disappoint.