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You don't need the actuator, that is for physically moving something like a latch on a window. You can hook this timer up directly to your pump, that's exactly what we did here: http://plant-watering-system.com/, I think you'll find this useful. It's even the same timer, BUT, I have to say that this timer is very cheap and stopped working after a few months, so I am looking at getting a more expensive/reliable one.
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