Dose-O-Mat. Automatic Metering Auto-Shutt-Off Valve. 1" DN25 Npt & Bspt threads. Flow Rate up to 5.0 m3/h [22 GPM]. Minimum Flow Rate 0.5 m3/h [2.2 GPM]. Connections Npt & Bspt male threads. AMV Dose-O-Mat 1in [25mm]. This Shutt-Off Valve is an excellent solution for Irrigation Systems or to fill precise water volume in small pools, tanks & vessels, animal drinking water, mining, cement mixers. No need for electricity or batteries. Arad K Model, comes in 5 different volume ranges. Substitutes old Bermadon.