gravity water valve
thingiverse
a simple water valve which works with a pump, it stops the water from flowing because of gravity when the pump is not working, I'm using it for my flowers when i'm on holiday (with an arduino). Just print the 2 parts, insert a steel ball (10-12.5mm) between the pieces and connect the hose. I printed with 0.8 nozzle so there was a bit of leakage that's why I added some tape
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