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Used commercial bottle caps with 2 air line inlets. One is used to harvest brine shrimp, held in place with an elastic band. The other airline goes to an air pump. The 2 parts are glued with superglue.
The float drains a tank when it reaches the upper limit because water flows in via the long opening causing it to sink, the reservoir is empties. There are 2 places for weights which can be sealed with aquarium silicon. Of course there…
18mm hose support to stop kinking for maximum flow. PETG, printed in edge to minimise supports. Shock cord to reduce vibration transfer, zip ties to secure. Freecad drawing .
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