GamaTech 110V/220V 15A/7.5A Pressostato Digitale per Pompe Acqua Pozzo 230PSI
(Ex.: If the switch is connected to 220v, the pump must be 220v also! - For 220V: both black and red wires are hot, green/yellow wire is ground. - Adjustable hi/low pressure as simple as pressing a button. ).