Product details:

Series 1630 Large Diaphragm Differential Pressure Switch, Range 3.0-12" w.c., Approx Deadband @ 0.11 Min. Set Point, 0.30 Max. Set PointOur highest precision conventional large diaphragm pressure switch provides maximum dependability. In addition, it incorporates a visible set point indicator for maximum convenience. UL and CSA listed, FM approved for general service, these switches are suitable for most applications in air conditioning and industrial service. Electrical capability of 15 amps handles most small electrical loads.Caution: For Use Only With Air Or Compatible Gases.