Flow meter replacement insert for all flow meters except for FM-2B and FMBX Easy to install Replaceable Calsense Flow Meters, model FM, are used with all Calsense irrigation controllers to monitor real-time flow of potable or non-potable water making them important tools in detecting mainline and lateral breaks on an irrigation system. Real-time system flows are learned automatically at night when irrigation comes on so that constant flow rates are measured, in order to provide the most accurate and reliable monitoring of breaks and problems as they occur. Suitable for Use With Irrigation Controllers Color White, Blue Item Controller Regulated No Type Parts and Attachments