Add-A-Zone RCO860009 Single-Wire Dual-Zone Module

Individual Valve Control  Time Saver  No Need to Dig Two valves on only one wire: Let Add-A-Zone solve your irrigation problems! Workaround broken zone wires.  Add a new zone without adding new wiring.  Add-A-Zone is the proven way to independently control two zone valves with only one pair of field wires.  Unlike other “switching” units, the Add-A-Zone behaves just like the valves are fully independent.  A patented unit installed at the controller allows the use of two separate zones while sending the signal through only one field wire.  Documents: AddA Zone FAQ