18mm Threaded to 12mm Garden Hose adapter
thingiverse
I bought a cheap 12v pump online and could not find a connector that would screw on to the inlet or outlet. So, here it is. It is threaded one side, M18 x 1.25. Running a tap from a Tap & Die set through the printed thread makes for a far better fit, but that may just be my printer.
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