... can open and close the pumps automatically, to achieve unmanned automatic pressure controller for water pump detail information : Product Specifications:Available for ... : USR, CNR-enclosed, double pole, single-phase pressure operated automatic switchTesting standard: UL standards 508 of America, Canadian standards c22 ... 20A/230V, 2.5hp 12A /230V, 3.0hp, 17A Pressure Controller for water pump