Single Pressure Controls Low Pressure Switch Type SPST Switch Action Opens On Low Pressure Range (PSI) (12 in) to 50 Differential Pressure (PSI) 5 to 35 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