TP971A2003 Honeywell Pneumatic Day/Night Thermostat

Honeywell Pneumatic Day/Night Thermostat, TP971 Series, 2 Pipes, Direct Action, Day, Night Setpoint, 13 psi Day, 18 psi Night Air Pressure, 59 to 90 deg F Day, 50 to 80 deg F Night, 0.011 scfm Flow Rate, 2 to 10 deg F Throttling, Wall Mounting, 3-1/4 in H x 2 in W x 1-5/8 in D