Pressure Switch, Type High, Switch Type SPST, Switch Action Opens On High Pressure, Range (PSI) 150-700, Open (PSI) 610, Differential Pressure (PSI) 610, Reset Manual, Pressure Connection 1/4" Female SAE, Capillary Length (In.) 18, Mounting Universal, Enclosure NEMA 1, Function To Protect the Compressor Loss of Refrigerant in Commercial Refrigeration and Air Conditioning Systems, Application For Refrigerants R 12, R 22, R 134A and R 502, In Commercial Refrigeration.SpecificationOpen (PSI) : 610 Differential Pressure (PSI) : 610 Reset : Manual Pressure Connection : 1/4" Female SAE Capillary Length (In.) : 18 WARNING:California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.