Siemens QBM81-10 Differential Pressure Switch, 0.4 - 4.0 Inch WC, Adjustable, Metric

Siemens QBM81-10 Differential Pressure Switch, 0.4 - 4.0 Inch WC, Adjustable, Metric. Siemens QBM81 Series Differential Switches for air and nonaggressive gases. For ventilation and AC plants to monitor air filters, air flow, fan belts, etc.