FLOW RANGE Wireless Flow Sensor Diameter Operating Range (GPM) Wireless Flow Sensor Diameter Operating Range (GPM) Minimum Suggested Maximum* 1" 2 17 1½" 5 35 2" 10 55 3" 28 120 4" 34 200 Note: * Good design practice dictates the maximum flow not to exceed 5'/sec. Suggested maximum flow is based upon Class 200 IPS plastic pipe.