Servo Operated Aquarium Valve
thingiverse
This servo operated valve (inspired by thing 2635085) uses small valves like these: https://www.amazon.com/gp/product/B00880E10E/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 Along with a 9G servo, it also requires 4 20mm M3 screws and 4 M3 nuts.
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