LF10-W pressure switch provide time tested, reliable control for automatic water systems. The switch is universally acceptable for use as original equipment on water pumps or pumping systems. Lf10-WR can prevent thepump from starting whenever the system falls considerable below cut-in pressure. Upon the restorations of the water supply, it will automatically cut-in. A manual reset level is depressed until a build up of system pressure permits automatic operation. Its simple design makes it easy to use for professionals and nonprofessionals alike.