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I had some empty phiales of an alimentary integrator and i decided to obtain unidirectional valves.Material:1) 1 Empty integrator Phiales(plastic).2) 1 EuroCent (the important is that the diameter ...
make a hole in the cap
Cut a piece of tape(narrower than tape)Attach the piece of tape to the coin.(for better sealing you can also cover the other face with tape as a gasket)Attach ...
Cut the bottom of the bottle with saw or cutter.If you want the valve to be more compact you can cut also much closer to the cap reducing ...
Of course you can use also different kind of bottles, but the space between the cap and bottleneck is critical because the coin must have the room to ...
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