The new and innovative vane-operated flow switch is an inexpensive switch that is ideal to start and stop electronic operated equipment when flow or no-flow conditions occur. Magnetic operation is simple and dependable with no mechanical linkages or seals to wear or leak. Lower body is machined solid metal bar stock assuring no leak points, no matter how long the unit is in service. Design is weatherproof, meeting NEMA 4X, for application versatility. Vane design is rigid and field trimmable for set point adjustment. The switch is rated to 250 psi and 250 degrees F and is UL 353 approved.