volumetric water meter 1,rotary piston type 2,Brass body 3,conform to ISO 4064 class B 4,high quality Feature:--Volumetric rotary piston principle ... International Standard ISO4064APPLICATIONMeasuring the volume of cold portable water passing through the pipelineFEATURESVolumetric meter, on principle of piston rotation, accurate measurement, easy ...