To use with pumps and heaters. The flow switch has a 10A microswitch that provides closed dry contact when there is a water flow and open contact when there is no water flow. Wiring is required by a licensed electrician. If you prefer prewired, please check prewired option listed on our website. Micro Switch Rating: 25A Maximum 230V Turn On at and above 30 GPM flow. Turn off at and below 20 GPM flow. 2" PVC Inlet and outlet spigot connections, Glue type, insert flow switch into 2" pipe socket and glue it. Wetted Surfaces - PVC, Polypropylene, Buna N, SS304 Line Pressure: 90 PSI Temperature: Up to 110 deg F Underwriters Laboratories recognized. 25A dry contact. 1/2" Electrical Conduit Connection Useful in the following applications: Pump Systems Blending or Additive Systems Liquid Transfer Systems Fire Sprinkler Systems Water Treatment Systems Solar systems Pool cleaning systems Irrigation systems