Tap drip irrigation for 4mm tube
thingiverse
https://www.thingiverse.com/thing:2930893 offers a valve for irrigation system. I adjusted the end points to fit 4 mm tubes (inner size) by replacing them with the top of https://www.thingiverse.com/thing:4490015 V2_PET_Cap_Outer_Adapter.stl (I can't seem to "remix" 2 items into 1 on thingiverse?) Note: it does not completely close, that's rather impossible with PLA prints. it creates a very slow dripper when you close it as far as possible. Add teflon tape on the valve thread for better closing on the valve end.
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