I would change all 3 of your valves to conventional solenoid normally closed valves. I would then get a real controller conventional Rainbird, Hunter, Toro-Irritrol, etc. I would then connect the valves to the timer or controller with low voltage direct burial cable. I would used water tight wire connectors. And I would have the piece of mind that the job was done right and that I would never have to deal with this issue again.
You only have 3 valves, so how hard can it be.
If that is too much labor you could always go with 3 battery operated valves with a battery operated controller. There are good options now.
Good Luck