Pneumatic Electric Switch, 2-25 PSI Setpoint Range, 1 PSI Differential Pressure Range, Panel Mount, Barb Fitting Air Connection for 1/4" OD Plastic Tubing, 40-140 Degree Temperature Range, 5-95% RH Operating Humidity Range, Make COM-NC on Pressure Fall to Setpoint, Make COM-NO on Pressure Rise to Setpoint plus Differential, Switch Operation Converts Pneumatic Signal to Electrical Switching Action (SPDT)