Pressure Switch 1.Reset method: auto reset, manual reset 2.Fitting structure: copper tube welding, copper flare fitting The pressure control is used for ... : auto reset, manual reset2. Pressure range: extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low (3 ~ 145PSI), vacuum (-7.4 ~ 0PSI)3 ... +/-15+/-15MPS350High Pressure350- -+/-15+/-15MPS450Manual Reset450- -+/-15+/-15 heat pump Pressure Switch