Gems Sensors FS-480 Series Stainless Steel 316 Flow Switch with Low Pressure Drop, Inline, Piston Type, 0.5 gpm Flow Setting, 1/2" NPT Male Wetted Materials: 316 Stainless Steel, PPS, Epoxy, Fluorocarbon Electrical Termination: 22 AWG, 24"-26" long PVC Cable Switch Type: SPST, N.O. (20VA) Set Point Differential (Maximum): 0.2 Recommended Filtration: 100 micron