Dwyer 1900-5 Low Differential Pressure Switch, Refurbished.

Dwyer 1900-5 Compact Low Differential Pressure Switch, Refurbished. W22C. 1900-5-MR. 3.0-11.75" W.C.  Range, SPDT Switch Type. Max. Pressure 45 IN. W.C. Surge Pressure 10 PSI. MAX. Temperature 110 F. 43 C. Use NO. 14 AWG Cu Wire.  1/2" Conduit Electrical Connection, Manual Reset Button. PAT. 3,566,060. Free US Shipping.