16/1 x 2500' - 16 AWG Underground Sprinkler Wire (White)
16 gauge direct burial wire; single strand.
Sold in 2500 foot rolls.
Professional grade wire for a professional installation.
White wire is used for the ground (common) wire for the valves. A single white wire is run from the controller to the closest valve and then continues to each valve. You will end up with one white wire connecting the valves to the controller.