To use with pumps and heaters. The flow switch has a 25A microswitch that provides closed dry contact when there is water flow and open contact when there is no water flow. Micro Switch Rating: 25A Maximum 230V Maximum flow through switch: 13 GPM. Not suitable for single faucet use. Please use 5A switch for single faucet, see our other listings. Turn On at and above 1.2 GPM flow. Turn off at and below 0.5 GPM flow. 1" PVC Inlet and outlet socket connections, Glue type, insert 1" pipe into the flow switch and glue it. Wetted Surfaces - PVC, Polypropylene, Buna N, No metal parts in wetted area. Line Pressure: 90 PSI Temperature: Up to 110 deg F Underwriters Laboratories recognized. 10A 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 Note: 1. Adding flow switch in the line will add pressure drop and restrict the water flow. You can expect 10-15 GPM maximum water flow through our 1" flow switch depending on your water pressure. 2. Installation and troubleshooting instructions are available on our website.