Siemens 194-3143 ROOM THERMOSTAT KIT, PNEUMATIC, DA, CELSIUS, DSP, DAY/NIGHT, 2-PIPESiemens 194 3143 Room Thermostat Kit, Pneumatic, DA, Celsius, DSP, Day Night, 2 pipe This Powerstar Retroline Day Night Retrostat Pneumatic Room Thermostat Kit is a 2 pipe, Dual Set Point, Direct Acting, Direct Acting Day 15 psi, Direct Acting Night 20 psi with a Celsius scale. Additional Information Mounting2 pipe DisplayDual Setpoint Operating rangeDay Night Measuring rangeCelsius