... water heaters. It can also be used to pneumatic andhydraulic pressure control systems of all kinds of industrial and agricultural HVACmachines ... (types classified by):1. Reset method: auto reset, manual reset2. Pressure range: extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low ... +/-15+/-15MPS350High Pressure350- -+/-15+/-15MPS450Manual Reset450- -+/-15+/-15 air compressor pressure regulator switch