iPolymer Metering Valve (MV) use a tapered plug-stem to give a fine adjustment to the flow in addition to a fully open or fully closed shutoff position. The PTFE all-wetted surface design works equally well with ultra clean DI water and harsh chemical media. As with all Metering Valves, we recommend filtering the media prior to entering the valve. Our Metering Valves come in two configurations: Straight Flow Pattern ("A") and Angled Flow Pattern ("B").