I have two valves next to each other and one has lost continuity back to the controller on the non gnd wire. Isn't there a switcher device that these two valves can be hooked to at the valve end? Then when the unit runs it would run one valve and the next time it would run the other valve. I am trying to avoid using the 521 to find break since this valve is a long way across a lot of pavement. I could use a battery powered valve but that takes time to install. Since the controller has three programs I could run these two valves off B and run it every day that way the two areas would get water every other day... Does any of this make sense.