Single Pressure Controls Low Pressure Switch Type SPST Switch Action Opens On Low Pressure Range (PSI) (10 in) to 100 Differential Pressure (PSI) 10 to 40 Auto Reset 36 in Capillary with 1/4 in Flare Nut Pressure Connection Capillary Length (In.) 36 in Universal Copper Capillary withFlare Nut NEMA 1 To Protect the Compressor Loss of Refrigerant in Commercial Refrigeration and Air Conditioning Systems