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Check out pHaestus pump wiring article, for details. What you want, is a SS relay that can handle the current that is being supplied to the pump, so check your pump: if it needs 1 amp, then try to get a relay that can handle more than that, like 2 amps. On the other side, you have to make a design decision: are you going to power the relay from a 12v line, or a 5v line? Try to find something that has a high resistance, because you don't want the relay to draw a lot of power from the PSU.
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