This Powerstar Retroline Day/Night Retrostat Pneumatic Room Thermostat Kit is a 2-pipe, Dual Set Point, Direct Acting, Day 15 psi, Night 20 psi with a Fahrenheit scale. Replaces Johnson Controls T-4506-201, 202, 203, 204.; The Siemens 194-3043 RETROSTAT JOHNSON D/N DA
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