The HDI 2250 Valve Position Indicator System is a reliable way to monitor if the valve is open or closed on the manifold.  The HDI 2250 Valve Position Indicator System allows two ways of indentifying if a valve is open or closed; 1) you will visually observe the position on the valve itself, and 2) electronically, where an electronic signal is sent to the console which clearly illustrates which valves are open or closed.