Pneumatic Heating/Cooling Thermostat, 2 Pipe, Direct Acting Heating , Reverse Acting Cooling, Single Setpoint, 59-90 Degree Setpoint Temperature Range, 18 Psi Heat Changeover, 13 Psi Cool Changeover, 2-10 Degree Throttling Range, 0.011 Scfm Airflow Usage, Wall Mount, Bimetal Sensir Element, 25 Psi Maximum Operating Pressure