... auto reset, manual reset 2.Fitting structure: copper tube welding, copper flare fitting HVAC The pressure control is used for high and ... control method: SPST (two wires), SPDT (three wires)4. Fitting structure: copper tube welding, copper flare fitting5. Connection: cartridge (terminal ... 15MPS350High Pressure350- -+/-15+/-15MPS450Manual Reset450- -+/-15+/-15 air compressor pressure regulator switch