servo driven mini valve
thingiverse
For watering plants, I sought a low-cost, compact valve; thus, I opted for one typically used in fish tanks at roughly 1 Euro each. A common Amazon listing for this valve is here: http://www.amazon.de/dp/B001PNUEA2. To assemble, shorten the valve lever and servoarm to fit within the coupling, then secure the components inside the housing without needing glue.
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