Proportional Pressuretrol Controller, 0-15 PSI Operating Pressure Range, 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

Proportional Pressuretrol Controller, 5-150 PSI Operating Pressure Range, 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