Reliance Aqua Tainer pump adapter
thingiverse
This is an adapter to fit a cheap pump from Amazon ($10) onto a Reliance Aqua Tainer water jug. It is a snug fit for my pump and the thread works great (kudos to the great thread library at https://github.com/adrianschlatter/threadlib/ ). I hope that most of these pumps available from Amazon fit the same - they were all built to fit 5 gallon water jugs. The OpenSCAD source file is included in case you want to make modifications. It is not very parameterized, though. Can be printed without support. I printed mine with PLA, it does not really need to be watertight and that is what I had installed. Otherwise I probably would have used PETG but both should work great.
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