It depends how old the set up is as we have used a few over the years but the current one we use is 11V DC output, tip positive 1600mA. As long as it is at least 9V and not more than 12V and at least 1200mA you should be fine. On the oldest models we used a 800mA power supply but the current pump while identical on the outside has a double o ring seal and draws a bit more power as a result.
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