Proportional Pressuretrol Controller, 0-15 PSI Operating Pressure Range, 0.5 PSI...
Honeywell Boiler Proportioning Pressure Control

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0.5 PSI Pressure Differential, Single Potentiometer, 140 Ohms, Use with Steam, Air, Noncombustible Gas or other Non Corrosive Fluids, 1/4" NPT External Thread, Brass Bellows, 32-150 Degree Temperature Range
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Manufacturer Info
Honeywell