Netafim Plastic M Water Meter, 3/4 Inch, 0.1 Gallons Per Pulse, Reed Switch Register (WM-075-0.1-RS-P)M Water Meters are the industrys smallest water meters. They offer the best cost, performance and long life. The M utilizes the multi jet principle assuring an equally distributed load on the impeller minimizing wear and maintaining accuracy. Wide clearances in the measuring chamber and negligible area of contact between static and moving parts are the main reasons for the high reliability of this design even in hard water. Available in 3 4", 1"