I finally used the two remaining zones on my Gen 2 controller. Loved the ease of testing the lines with my phone. I connected the controller & drip lines to a cute little Antelco eZyvalve 4 Zone valve box. Talk about convenient off the shelf solutions! I love the valve box so far. Time will tell if the valves are reliable. I don’t have the wires & I lack controller zones for the last two valves So I suppose the last two valves will be spares for now.