Dosatron Water Meter with Couplers, 1 Pulse per Gallon, 3/4 InchIn general terms, Water Meters determine the flow through a specific portion of a system. They indicate the volume of water that has flowed through the pipe. Most water meters are totalizing, and some also give the instant flow rate. Some water meters emit a pulse that can be tied to a PLC. Features Reads in gallons 1 Pulse Per Gallon Light weight Totalizing Made of polypropylene